Stderr output

<core_client_version>8.0.2</core_client_version>
<![CDATA[
<message>
Unbekannter Fehler
 (0x80004005) - exit code 2147500037 (0x80004005)</message>
<stderr_txt>
2024-06-25 20:01:51 (10144): vboxwrapper version 26207
2024-06-25 20:01:51 (10144): BOINC client version: 8.0.2
2024-06-25 20:01:51 (10144): Detected: VirtualBox VboxManage Interface (Version: 7.0.14)
2024-06-25 20:01:52 (10144): Detected: Heartbeat check (file: 'heartbeat' every 1200.000000 seconds)
2024-06-25 20:01:52 (10144): Successfully copied 'init_data.xml' to the shared directory.
2024-06-25 20:01:52 (10144): Successfully copied 'input' to the shared directory.
2024-06-25 20:01:52 (10144): Create VM. (boinc_a17be1f33ba3ec42, slot#10)
2024-06-25 20:01:52 (10144): Setting Memory Size for VM. (630MB)
2024-06-25 20:01:53 (10144): Setting CPU Count for VM. (1)
2024-06-25 20:01:53 (10144): Setting Chipset Options for VM.
2024-06-25 20:01:53 (10144): Setting Graphics Controller Options for VM.
2024-06-25 20:01:53 (10144): Setting Boot Options for VM.
2024-06-25 20:01:54 (10144): Setting Network Configuration for NAT.
2024-06-25 20:01:54 (10144): Enabling VM Network Access.
2024-06-25 20:01:54 (10144): Disabling USB Support for VM.
2024-06-25 20:01:54 (10144): Disabling COM Port Support for VM.
2024-06-25 20:01:55 (10144): Disabling LPT Port Support for VM.
2024-06-25 20:01:55 (10144): Disabling Audio Support for VM.
2024-06-25 20:01:55 (10144): Disabling Clipboard Support for VM.
2024-06-25 20:01:56 (10144): Disabling Drag and Drop Support for VM.
2024-06-25 20:01:56 (10144): Adding storage controller(s) to VM.
2024-06-25 20:01:56 (10144): Adding virtual disk drive to VM. (Theory_2024_04_30_prod.vdi)
2024-06-25 20:01:58 (10144): Adding VirtualBox Guest Additions to VM.
2024-06-25 20:01:59 (10144): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2024-06-25 20:01:59 (10144): forwarding host port 50674 to guest port 80
2024-06-25 20:01:59 (10144): Enabling remote desktop for VM.
2024-06-25 20:01:59 (10144): Required extension pack not installed, remote desktop not enabled.
2024-06-25 20:01:59 (10144): Enabling shared directory for VM.
2024-06-25 20:02:00 (10144): Starting VM using VBoxManage interface. (boinc_a17be1f33ba3ec42, slot#10)
2024-06-25 20:02:04 (10144): Error in start VM for VM: -2147467259
Command:
VBoxManage -q startvm "boinc_a17be1f33ba3ec42" --type headless
Output:
VBoxManage.exe: error: Not in a hypervisor partition (HVP=0) (VERR_NEM_NOT_AVAILABLE).
VBoxManage.exe: error: AMD-V is disabled in the BIOS (or by the host OS) (VERR_SVM_DISABLED)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole
Waiting for VM "boinc_a17be1f33ba3ec42" to power on...

2024-06-25 20:02:04 (10144): VM failed to start.
2024-06-25 20:02:04 (10144): Could not start 
2024-06-25 20:02:04 (10144): ERROR: VM failed to start
2024-06-25 20:02:04 (10144): Powering off VM.
2024-06-25 20:02:04 (10144): Deregistering VM. (boinc_a17be1f33ba3ec42, slot#10)
2024-06-25 20:02:04 (10144): Removing network bandwidth throttle group from VM.
2024-06-25 20:02:04 (10144): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:06.148208          Saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:06.154849          Finished saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml"
00:00:06.657364          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:06.657860          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:06.658117          Saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:06.663895          Finished saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml"
00:00:06.664469          Saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox" with version "1.19-windows"
00:00:06.667453          Finished saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox"
00:00:06.924281          Saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox" with version "1.19-windows"
00:00:06.927663          Finished saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox"
00:00:07.203741          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:07.204316          Saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox" with version "1.19-windows"
00:00:07.207299          Finished saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox"
00:00:07.207461          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:07.208803          Saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox" with version "1.19-windows"
00:00:07.210998          Finished saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox"
00:00:07.211510          Saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox" with version "1.19-windows"
00:00:07.213601          Finished saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox"
00:00:07.456240          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:07.457626          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:07.457779          Saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:07.460577          Finished saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml"
00:00:07.460901          Saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:07.463626          Finished saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml"
00:00:07.463998          Saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox" with version "1.19-windows"
00:00:07.466717          Finished saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox"
00:00:07.710745          Saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox" with version "1.19-windows"
00:00:07.713971          Finished saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox"
00:00:07.969255          Saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox" with version "1.19-windows"
00:00:07.971539          Finished saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox"
00:00:08.499453          Saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox" with version "1.19-windows"
00:00:08.501870          Finished saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox"
00:00:08.811865          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={7682d5eb-f00e-44f1-8ca2-99d08b1cd607} aComponent={VirtualBoxWrap} aText={&#197;&#131;o extension pack providing a cryptographic support module could be found}, preserve=false aResultDetail=0
00:00:08.820189          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:08.820300          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:08.836405          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
00:00:09.065208          Launched VM: 143036528 pid: 8924 (0x22dc) frontend: headless name: boinc_a17be1f33ba3ec42
00:00:12.861160          Saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox" with version "1.19-windows"
00:00:12.863793          Finished saving settings file "E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox"
00:00:12.917670          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
00:00:13.251359          Saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:13.255354          Finished saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml"
00:00:13.255502          Saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:13.260015          Finished saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml"
00:00:13.261046 DeleteVM Saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:13.264954 DeleteVM Finished saving settings file "C:\Users\Fabia\.VirtualBox\VirtualBox.xml"
00:00:18.271356 main     VirtualBox: object deletion starts
00:00:18.272704 main     HostDnsMonitor: shutting down ...
00:00:18.272765 main     HostDnsMonitor: shut down
00:00:18.277300 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
00:00:18.277513 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

42" --basefolder "E:\WorldCommunityGridDATA\slots\10" --ostype "Linux26_64" --register
Exit Code: 0
Output:
Virtual machine 'boinc_a17be1f33ba3ec42' is created and registered.
UUID: fbc1d3ed-7a46-4bb4-88ca-0794e5638cbd
Settings file: 'E:\WorldCommunityGridDATA\slots\10\boinc_a17be1f33ba3ec42\boinc_a17be1f33ba3ec42.vbox'

2024-06-25 20:01:52 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --description "Theory_2743-2684351-241_2" 
Exit Code: 0
Output:

2024-06-25 20:01:53 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --memory 630 
Exit Code: 0
Output:

2024-06-25 20:01:53 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --cpus 1 
Exit Code: 0
Output:

2024-06-25 20:01:53 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2024-06-25 20:01:53 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2024-06-25 20:01:54 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2024-06-25 20:01:54 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --nic1 nat --natdnsproxy1 on --cableconnected1 off 
Exit Code: 0
Output:

2024-06-25 20:01:54 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --cableconnected1 on 
Exit Code: 0
Output:

2024-06-25 20:01:54 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --usb off 
Exit Code: 0
Output:

2024-06-25 20:01:55 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --uart1 off --uart2 off 
Exit Code: 0
Output:

2024-06-25 20:01:55 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2024-06-25 20:01:55 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --audio-enabled off 
Exit Code: 0
Output:

2024-06-25 20:01:56 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --clipboard disabled 
Exit Code: 0
Output:

2024-06-25 20:01:56 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --draganddrop disabled 
Exit Code: 0
Output:

2024-06-25 20:01:56 (10144): 
Command: VBoxManage -q storagectl "boinc_a17be1f33ba3ec42" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2024-06-25 20:01:56 (10144): 
Command: VBoxManage -q showhdinfo "E:\WorldCommunityGridDATA/projects/lhcathome.cern.ch_lhcathome/Theory_2024_04_30_prod.vdi" 
Exit Code: 0
Output:
UUID:           3bbae7b0-9837-4992-8ac4-5c7feef1de80
Parent UUID:    base
State:          created
Type:           multiattach
Location:       E:\WorldCommunityGridDATA\projects\lhcathome.cern.ch_lhcathome\Theory_2024_04_30_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   781 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2024-06-25 20:01:57 (10144): 
Command: VBoxManage -q storageattach "boinc_a17be1f33ba3ec42" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "E:\WorldCommunityGridDATA/projects/lhcathome.cern.ch_lhcathome/Theory_2024_04_30_prod.vdi" 
Exit Code: -2135228409
Output:
VBoxManage.exe: error: Cannot attach medium 'E:\WorldCommunityGridDATA\projects\lhcathome.cern.ch_lhcathome\Theory_2024_04_30_prod.vdi': the media type 'MultiAttach' can only be attached to machines that were created with VirtualBox 4.0 or later
VBoxManage.exe: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component SessionMachine, interface IMachine, callee IUnknown
VBoxManage.exe: error: Context: "AttachDevice(Bstr(pszCtl).raw(), port, device, DeviceType_HardDisk, pMedium2Mount)" at line 785 of file VBoxManageStorageController.cpp

2024-06-25 20:01:57 (10144): 
Command: VBoxManage -q showhdinfo "E:\WorldCommunityGridDATA/projects/lhcathome.cern.ch_lhcathome/Theory_2024_04_30_prod.vdi" 
Exit Code: 0
Output:
UUID:           3bbae7b0-9837-4992-8ac4-5c7feef1de80
Parent UUID:    base
State:          created
Type:           multiattach
Location:       E:\WorldCommunityGridDATA\projects\lhcathome.cern.ch_lhcathome\Theory_2024_04_30_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   781 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2024-06-25 20:01:57 (10144): 
Command: VBoxManage -q closemedium disk "E:\WorldCommunityGridDATA\projects\lhcathome.cern.ch_lhcathome\Theory_2024_04_30_prod.vdi" 
Exit Code: 0
Output:

2024-06-25 20:01:57 (10144): 
Command: VBoxManage -q showhdinfo "E:\WorldCommunityGridDATA/projects/lhcathome.cern.ch_lhcathome/Theory_2024_04_30_prod.vdi" 
Exit Code: 0
Output:
UUID:           3bbae7b0-9837-4992-8ac4-5c7feef1de80
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       E:\WorldCommunityGridDATA\projects\lhcathome.cern.ch_lhcathome\Theory_2024_04_30_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   781 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2024-06-25 20:01:58 (10144): 
Command: VBoxManage -q storageattach "boinc_a17be1f33ba3ec42" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "E:\WorldCommunityGridDATA/projects/lhcathome.cern.ch_lhcathome/Theory_2024_04_30_prod.vdi" 
Exit Code: 0
Output:

2024-06-25 20:01:58 (10144): 
Command: VBoxManage -q storageattach "boinc_a17be1f33ba3ec42" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2024-06-25 20:01:58 (10144): 
Command: VBoxManage -q storageattach "boinc_a17be1f33ba3ec42" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "E:\WorldCommunityGridDATA/projects/lhcathome.cern.ch_lhcathome/Theory_2024_04_30_prod.vdi" 
Exit Code: 0
Output:

2024-06-25 20:01:59 (10144): 
Command: VBoxManage -q storageattach "boinc_a17be1f33ba3ec42" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2024-06-25 20:01:59 (10144): 
Command: VBoxManage -q bandwidthctl "boinc_a17be1f33ba3ec42" add "boinc_a17be1f33ba3ec42_net" --type network --limit 1024G 
Exit Code: 0
Output:

2024-06-25 20:01:59 (10144): 
Command: VBoxManage -q modifyvm "boinc_a17be1f33ba3ec42" --natpf1 ",tcp,127.0.0.1,50674,,80" 
Exit Code: 0
Output:

2024-06-25 20:01:59 (10144): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2024-06-25 20:02:00 (10144): 
Command: VBoxManage -q sharedfolder add "boinc_a17be1f33ba3ec42" --name "shared" --hostpath "E:\WorldCommunityGridDATA\slots\10/shared"
Exit Code: 0
Output:

2024-06-25 20:02:04 (10144): 
Command: VBoxManage -q startvm "boinc_a17be1f33ba3ec42" --type headless
Exit Code: -2147467259
Output:
VBoxManage.exe: error: Not in a hypervisor partition (HVP=0) (VERR_NEM_NOT_AVAILABLE).
VBoxManage.exe: error: AMD-V is disabled in the BIOS (or by the host OS) (VERR_SVM_DISABLED)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole
Waiting for VM "boinc_a17be1f33ba3ec42" to power on...

2024-06-25 20:02:04 (10144): 
Command: VBoxManage -q snapshot "boinc_a17be1f33ba3ec42" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2024-06-25 20:02:04 (10144): 
Command: VBoxManage -q bandwidthctl "boinc_a17be1f33ba3ec42" remove "boinc_a17be1f33ba3ec42_net" 
Exit Code: 0
Output:
VBoxManage.exe: error: Bandwidth groups cannot be deleted while the VM is running

2024-06-25 20:02:04 (10144): 
Command: VBoxManage -q unregistervm "boinc_a17be1f33ba3ec42" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

2024-06-25 20:02:09 (10144): called boinc_finish(-2147467259)

</stderr_txt>
]]>

©2024 CERN