Stderr output

<core_client_version>8.0.2</core_client_version>
<![CDATA[
<message>
Niepoprawna funkcja.
 (0x1) - exit code 1 (0x1)</message>
<stderr_txt>
2025-03-16 12:09:46 (10192): vboxwrapper version 26208
2025-03-16 12:09:46 (10192): BOINC client version: 8.0.2
2025-03-16 12:10:07 (10192): Detected: VirtualBox VboxManage Interface (Version: 7.0.20)
2025-03-16 12:10:08 (10192): Detected: Heartbeat check (file: 'heartbeat' every 1200.000000 seconds)
2025-03-16 12:10:08 (10192): Successfully copied 'init_data.xml' to the shared directory.
2025-03-16 12:10:08 (10192): Successfully copied 'input' to the shared directory.
2025-03-16 12:10:54 (10192): Error: Timeout
2025-03-16 12:10:54 (10192): ERROR: VM failed to start
2025-03-16 12:10:59 (10192): 
   BOINC will be notified that it needs to clean up the environment.
         This is a temporary problem and so this job will be rescheduled for another time.

2025-03-17 11:27:11 (19280): vboxwrapper version 26208
2025-03-17 11:27:11 (19280): BOINC client version: 8.0.2
2025-03-17 11:27:12 (19280): Detected: VirtualBox VboxManage Interface (Version: 7.0.20)
2025-03-17 11:27:12 (19280): Detected: Heartbeat check (file: 'heartbeat' every 1200.000000 seconds)
2025-03-17 11:27:12 (19280): Create VM. (boinc_9175a888b6cbc845, slot#12)
2025-03-17 11:27:13 (19280): Setting Memory Size for VM. (630MB)
2025-03-17 11:27:13 (19280): Setting CPU Count for VM. (1)
2025-03-17 11:27:13 (19280): Setting Chipset Options for VM.
2025-03-17 11:27:14 (19280): Setting Graphics Controller Options for VM.
2025-03-17 11:27:14 (19280): Setting Boot Options for VM.
2025-03-17 11:27:14 (19280): Setting Network Configuration for NAT.
2025-03-17 11:27:14 (19280): Enabling VM Network Access.
2025-03-17 11:27:15 (19280): Disabling USB Support for VM.
2025-03-17 11:27:15 (19280): Disabling COM Port Support for VM.
2025-03-17 11:27:15 (19280): Disabling LPT Port Support for VM.
2025-03-17 11:27:15 (19280): Disabling Audio Support for VM.
2025-03-17 11:27:16 (19280): Disabling Clipboard Support for VM.
2025-03-17 11:27:16 (19280): Disabling Drag and Drop Support for VM.
2025-03-17 11:27:16 (19280): Adding storage controller(s) to VM.
2025-03-17 11:27:17 (19280): Adding virtual disk drive to VM. (Theory_2025_01_16_prod.vdi)
2025-03-17 11:27:18 (19280): Adding VirtualBox Guest Additions to VM.
2025-03-17 11:27:18 (19280): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-03-17 11:27:18 (19280): forwarding host port 50201 to guest port 80
2025-03-17 11:27:19 (19280): Enabling remote desktop for VM.
2025-03-17 11:27:19 (19280): Required extension pack not installed, remote desktop not enabled.
2025-03-17 11:27:19 (19280): Enabling shared directory for VM.
2025-03-17 11:27:19 (19280): Starting VM using VBoxManage interface. (boinc_9175a888b6cbc845, slot#12)
2025-03-17 11:27:20 (19280): Error in start VM for VM: 1
Command:
VBoxManage -q startvm "boinc_9175a888b6cbc845" --type headless
Output:
VBoxManage.exe: error: The virtual machine 'boinc_9175a888b6cbc845' has terminated unexpectedly during startup with exit code 1 (0x1).  More details may be available in 'C:\ProgramData\BOINC\slots\12\boinc_9175a888b6cbc845\Logs\VBoxHardening.log'
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine
Waiting for VM "boinc_9175a888b6cbc845" to power on...

2025-03-17 11:27:20 (19280): VM failed to start.
2025-03-17 11:27:20 (19280): Could not start 
2025-03-17 11:27:20 (19280): ERROR: VM failed to start
2025-03-17 11:27:20 (19280): Powering off VM.
2025-03-17 11:27:20 (19280): Deregistering VM. (boinc_9175a888b6cbc845, slot#12)
2025-03-17 11:27:20 (19280): Removing network bandwidth throttle group from VM.
2025-03-17 11:27:21 (19280): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:11.377096          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377104          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377111          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377118          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377126          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377133          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377140          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377147          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377154          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377161          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377169          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377176          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377183          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377190          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377198          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377206          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377214          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377221          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377228          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377235          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377242          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377249          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377256          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377264          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377271          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377278          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377286          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377293          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377300          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377308          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377315          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377322          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.377394          Saving settings file "C:\Users\lesat\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:11.380916          Finished saving settings file "C:\Users\lesat\.VirtualBox\VirtualBox.xml"
00:00:11.381010          Saving settings file "C:\Users\lesat\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:11.383649          Finished saving settings file "C:\Users\lesat\.VirtualBox\VirtualBox.xml"
00:00:11.384518 DeleteVM Saving settings file "C:\Users\lesat\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:11.388681 DeleteVM Finished saving settings file "C:\Users\lesat\.VirtualBox\VirtualBox.xml"
00:00:16.408437 main     VirtualBox: object deletion starts
00:00:16.409377 main     HostDnsMonitor: shutting down ...
00:00:16.409417 main     HostDnsMonitor: shut down
00:00:16.410264 Watcher  ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={7682d5eb-f00e-44f1-8ca2-99d08b1cd607} aComponent={VirtualBoxWrap} aText={The object is not ready}, preserve=false aResultDetail=0
00:00:16.410542 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

) Core(TM) i7-12700KF
Processor#3 speed: unknown
Processor#3 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#4 speed: unknown
Processor#4 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#5 speed: unknown
Processor#5 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#6 speed: unknown
Processor#6 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#7 speed: unknown
Processor#7 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#8 speed: unknown
Processor#8 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#9 speed: unknown
Processor#9 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#10 speed: unknown
Processor#10 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#11 speed: unknown
Processor#11 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#12 speed: unknown
Processor#12 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#13 speed: unknown
Processor#13 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#14 speed: unknown
Processor#14 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#15 speed: unknown
Processor#15 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#16 speed: unknown
Processor#16 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#17 speed: unknown
Processor#17 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#18 speed: unknown
Processor#18 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Processor#19 speed: unknown
Processor#19 description: 12th Gen Intel(R) Core(TM) i7-12700KF
Memory size: 32624 MByte
Memory available: 25897 MByte
Operating system: Windows 11
Operating system version: 10.0.26100

2025-03-17 11:27:12 (19280): 
Command: VBoxManage -q showvminfo "boinc_9175a888b6cbc845" --machinereadable 
Exit Code: -2135228415
Output:
VBoxManage.exe: error: Could not find a registered machine named 'boinc_9175a888b6cbc845'
VBoxManage.exe: error: Details: code VBOX_E_OBJECT_NOT_FOUND (0x80bb0001), component VirtualBoxWrap, interface IVirtualBox, callee IUnknown
VBoxManage.exe: error: Context: "FindMachine(Bstr(VMNameOrUuid).raw(), machine.asOutParam())" at line 3139 of file VBoxManageInfo.cpp

2025-03-17 11:27:13 (19280): 
Command: VBoxManage -q createvm --name "boinc_9175a888b6cbc845" --basefolder "C:\ProgramData\BOINC\slots\12" --ostype "Linux26_64" --register
Exit Code: 0
Output:
Virtual machine 'boinc_9175a888b6cbc845' is created and registered.
UUID: 8739a948-b17c-4216-ae34-c8a9ae0b7f0a
Settings file: 'C:\ProgramData\BOINC\slots\12\boinc_9175a888b6cbc845\boinc_9175a888b6cbc845.vbox'

2025-03-17 11:27:13 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --description "Theory_2843-4262247-526_2" 
Exit Code: 0
Output:

2025-03-17 11:27:13 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --memory 630 
Exit Code: 0
Output:

2025-03-17 11:27:13 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --cpus 1 
Exit Code: 0
Output:

2025-03-17 11:27:14 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2025-03-17 11:27:14 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2025-03-17 11:27:14 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2025-03-17 11:27:14 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --nic1 nat --natdnsproxy1 on --cableconnected1 off 
Exit Code: 0
Output:

2025-03-17 11:27:15 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --cableconnected1 on 
Exit Code: 0
Output:

2025-03-17 11:27:15 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --usb off 
Exit Code: 0
Output:

2025-03-17 11:27:15 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-03-17 11:27:15 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-03-17 11:27:16 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --audio-enabled off 
Exit Code: 0
Output:

2025-03-17 11:27:16 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --clipboard disabled 
Exit Code: 0
Output:

2025-03-17 11:27:16 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --draganddrop disabled 
Exit Code: 0
Output:

2025-03-17 11:27:17 (19280): 
Command: VBoxManage -q storagectl "boinc_9175a888b6cbc845" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-03-17 11:27:17 (19280): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_01_16_prod.vdi" 
Exit Code: 0
Output:
UUID:           6a4110e9-e559-4c1c-bfd2-ba6f6aaf4169
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_01_16_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   781 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-03-17 11:27:17 (19280): 
Command: VBoxManage -q storageattach "boinc_9175a888b6cbc845" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_01_16_prod.vdi" 
Exit Code: 0
Output:

2025-03-17 11:27:17 (19280): 
Command: VBoxManage -q storageattach "boinc_9175a888b6cbc845" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2025-03-17 11:27:18 (19280): 
Command: VBoxManage -q storageattach "boinc_9175a888b6cbc845" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_01_16_prod.vdi" 
Exit Code: 0
Output:

2025-03-17 11:27:18 (19280): 
Command: VBoxManage -q storageattach "boinc_9175a888b6cbc845" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-03-17 11:27:18 (19280): 
Command: VBoxManage -q bandwidthctl "boinc_9175a888b6cbc845" add "boinc_9175a888b6cbc845_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-03-17 11:27:19 (19280): 
Command: VBoxManage -q modifyvm "boinc_9175a888b6cbc845" --natpf1 ",tcp,127.0.0.1,50201,,80" 
Exit Code: 0
Output:

2025-03-17 11:27:19 (19280): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-03-17 11:27:19 (19280): 
Command: VBoxManage -q sharedfolder add "boinc_9175a888b6cbc845" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\12/shared"
Exit Code: 0
Output:

2025-03-17 11:27:20 (19280): 
Command: VBoxManage -q startvm "boinc_9175a888b6cbc845" --type headless
Exit Code: 1
Output:
VBoxManage.exe: error: The virtual machine 'boinc_9175a888b6cbc845' has terminated unexpectedly during startup with exit code 1 (0x1).  More details may be available in 'C:\ProgramData\BOINC\slots\12\boinc_9175a888b6cbc845\Logs\VBoxHardening.log'
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine
Waiting for VM "boinc_9175a888b6cbc845" to power on...

2025-03-17 11:27:20 (19280): 
Command: VBoxManage -q snapshot "boinc_9175a888b6cbc845" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-03-17 11:27:21 (19280): 
Command: VBoxManage -q bandwidthctl "boinc_9175a888b6cbc845" remove "boinc_9175a888b6cbc845_net" 
Exit Code: 0
Output:

2025-03-17 11:27:21 (19280): 
Command: VBoxManage -q unregistervm "boinc_9175a888b6cbc845" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

2025-03-17 11:27:28 (19280): called boinc_finish(1)

</stderr_txt>
]]>

©2025 CERN