Stderr output

<core_client_version>8.0.2</core_client_version>
<![CDATA[
<message>
Unspecified error
 (0x80004005) - exit code 2147500037 (0x80004005)</message>
<stderr_txt>
2025-04-15 19:58:07 (1704): vboxwrapper version 26210
2025-04-15 19:58:07 (1704): BOINC client version: 8.0.2
2025-04-15 19:58:09 (1704): Detected: VirtualBox VboxManage Interface (Version: 7.0.18)
2025-04-15 19:58:09 (1704): Detected: Heartbeat check (file: 'heartbeat' every 1800.000000 seconds)
2025-04-15 19:58:09 (1704): Successfully copied 'init_data.xml' to the shared directory.
2025-04-15 19:58:09 (1704): Successfully copied 'input' to the shared directory.
2025-04-15 19:58:09 (1704): Create VM. (boinc_e3b4b1ea38a0e4ae, slot#5)
2025-04-15 19:58:10 (1704): Setting Memory Size for VM. (630MB)
2025-04-15 19:58:10 (1704): Setting CPU Count for VM. (1)
2025-04-15 19:58:10 (1704): Setting Chipset Options for VM.
2025-04-15 19:58:11 (1704): Setting Graphics Controller Options for VM. (Driver: VBoxVGA, 16MB)
2025-04-15 19:58:11 (1704): Setting Boot Options for VM.
2025-04-15 19:58:11 (1704): Setting Network Configuration for NAT. (Driver: virtio)
2025-04-15 19:58:12 (1704): Enabling VM Network Access.
2025-04-15 19:58:12 (1704): Disabling USB Support for VM.
2025-04-15 19:58:12 (1704): Disabling COM Port Support for VM.
2025-04-15 19:58:12 (1704): Disabling LPT Port Support for VM.
2025-04-15 19:58:13 (1704): Disabling Audio Support for VM.
2025-04-15 19:58:13 (1704): Disabling Clipboard Support for VM.
2025-04-15 19:58:13 (1704): Disabling Drag and Drop Support for VM.
2025-04-15 19:58:14 (1704): Adding storage controller(s) to VM.
2025-04-15 19:58:14 (1704): Adding virtual disk drive to VM. (Theory_2025_04_03_prod.vdi)
2025-04-15 19:58:16 (1704): Adding VirtualBox Guest Additions to VM.
2025-04-15 19:58:16 (1704): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-04-15 19:58:17 (1704): forwarding host port 52138 to guest port 80
2025-04-15 19:58:17 (1704): Enabling remote desktop for VM.
2025-04-15 19:58:17 (1704): Required extension pack not installed, remote desktop not enabled.
2025-04-15 19:58:17 (1704): Enabling shared directory for VM.
2025-04-15 19:58:18 (1704): Starting VM using VBoxManage interface. (boinc_e3b4b1ea38a0e4ae, slot#5)
2025-04-15 19:58:23 (1704): Error in start VM for VM: -2147467259
Command:
VBoxManage -q startvm "boinc_e3b4b1ea38a0e4ae" --type headless
Output:
VBoxManage.exe: error: Not in a hypervisor partition (HVP=0) (VERR_NEM_NOT_AVAILABLE).
VBoxManage.exe: error: VT-x is disabled in the BIOS for all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole
Waiting for VM "boinc_e3b4b1ea38a0e4ae" to power on...

2025-04-15 19:58:23 (1704): VM failed to start.
2025-04-15 19:58:23 (1704): Could not start 
2025-04-15 19:58:23 (1704): ERROR: VM failed to start
2025-04-15 19:58:23 (1704): Powering off VM.
2025-04-15 19:58:23 (1704): Deregistering VM. (boinc_e3b4b1ea38a0e4ae, slot#5)
2025-04-15 19:58:23 (1704): Removing network bandwidth throttle group from VM.
2025-04-15 19:58:23 (1704): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:09.645273          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:09.645288          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:09.645299          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:09.650104          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
00:00:09.661095          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
00:00:09.661171          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
00:00:09.667947          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
00:00:09.861005          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:09.861034          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:09.861045          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:09.861054          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:09.867668          Launched VM: 2398643440 pid: 15952 (0x3e50) frontend: headless name: boinc_e3b4b1ea38a0e4ae
00:00:14.859303          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_e3b4b1ea38a0e4ae\boinc_e3b4b1ea38a0e4ae.vbox" with version "1.19-windows"
00:00:14.866289          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_e3b4b1ea38a0e4ae\boinc_e3b4b1ea38a0e4ae.vbox"
00:00:14.968332          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:14.968366          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:14.968377          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:14.968386          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:14.970261          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
00:00:15.066393          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.066504          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.066529          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.066545          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.076433          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_e3b4b1ea38a0e4ae\boinc_e3b4b1ea38a0e4ae.vbox" with version "1.19-windows"
00:00:15.090249          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_e3b4b1ea38a0e4ae\boinc_e3b4b1ea38a0e4ae.vbox"
00:00:15.330417          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.330466          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.330477          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.330488          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.331185          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.331396          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.331467          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.331478          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:15.331616          Saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:15.337614          Finished saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml"
00:00:15.337867          Saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:15.342794          Finished saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml"
00:00:15.344798 DeleteVM Saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:15.350459 DeleteVM Finished saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml"
00:00:20.359710 main     VirtualBox: object deletion starts
00:00:20.361316 main     HostDnsMonitor: shutting down ...
00:00:20.361350 main     HostDnsMonitor: shut down
00:00:20.363707 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
00:00:20.364220 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

lerate2dvideo="off"
teleporterenabled="off"
teleporterport=0
teleporteraddress=""
teleporterpassword=""
tracing-enabled="off"
tracing-allow-vm-access="off"
tracing-config=""
autostart-enabled="off"
autostart-delay=0
defaultfrontend=""
vmprocpriority="default"
natnet1="nat"
macaddress1="08002743A46D"
cableconnected1="on"
nic1="nat"
nictype1="82540EM"
nicspeed1="0"
mtu="0"
sockSnd="64"
sockRcv="64"
tcpWndSnd="64"
tcpWndRcv="64"
nic2="none"
nic3="none"
nic4="none"
nic5="none"
nic6="none"
nic7="none"
nic8="none"
hidpointing="ps2mouse"
hidkeyboard="ps2kbd"
uart1="off"
uart2="off"
uart3="off"
uart4="off"
lpt1="off"
lpt2="off"
audio="default"
audio_out="off"
audio_in="off"
clipboard="disabled"
draganddrop="disabled"
vrde="off"
usb="off"
ehci="off"
xhci="off"
recording_enabled="off"
recording_screens=1
 rec_screen0
rec_screen_enabled="on"
rec_screen_id=0
rec_screen_video_enabled="on"
rec_screen_audio_enabled="off"
rec_screen_dest="File"
rec_screen_dest_filename="C:\\ProgramData\\BOINC\\slots\\5\\boinc_e3b4b1ea38a0e4ae\\boinc_e3b4b1ea38a0e4ae-screen0.webm"
rec_screen_opts="vc_enabled=true,ac_enabled=false,ac_profile=med"
rec_screen_video_res_xy="1024x768"
rec_screen_video_rate_kbps=512
rec_screen_video_fps=25
description="Theory_2848-4542934-601_1"
GuestMemoryBalloon=0

2025-04-15 19:58:12 (1704): 
Command: VBoxManage -q modifyvm "boinc_e3b4b1ea38a0e4ae" --nic1 nat --nic-type1 "virtio" --cable-connected1 off --nat-dns-proxy1 on 
Exit Code: 0
Output:

2025-04-15 19:58:12 (1704): 
Command: VBoxManage -q modifyvm "boinc_e3b4b1ea38a0e4ae" --cable-connected1 on 
Exit Code: 0
Output:

2025-04-15 19:58:12 (1704): 
Command: VBoxManage -q modifyvm "boinc_e3b4b1ea38a0e4ae" --usb off 
Exit Code: 0
Output:

2025-04-15 19:58:12 (1704): 
Command: VBoxManage -q modifyvm "boinc_e3b4b1ea38a0e4ae" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-04-15 19:58:13 (1704): 
Command: VBoxManage -q modifyvm "boinc_e3b4b1ea38a0e4ae" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-04-15 19:58:13 (1704): 
Command: VBoxManage -q modifyvm "boinc_e3b4b1ea38a0e4ae" --audio-enabled off 
Exit Code: 0
Output:

2025-04-15 19:58:13 (1704): 
Command: VBoxManage -q modifyvm "boinc_e3b4b1ea38a0e4ae" --clipboard disabled 
Exit Code: 0
Output:

2025-04-15 19:58:14 (1704): 
Command: VBoxManage -q modifyvm "boinc_e3b4b1ea38a0e4ae" --draganddrop disabled 
Exit Code: 0
Output:

2025-04-15 19:58:14 (1704): 
Command: VBoxManage -q storagectl "boinc_e3b4b1ea38a0e4ae" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-04-15 19:58:14 (1704): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_03_prod.vdi" 
Exit Code: 0
Output:
UUID:           1e3cee35-4ed8-40c2-9108-b352bcb83c50
Parent UUID:    base
State:          created
Type:           multiattach
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_04_03_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       10240 MBytes
Size on disk:   2429 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-04-15 19:58:14 (1704): 
Command: VBoxManage -q storageattach "boinc_e3b4b1ea38a0e4ae" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_03_prod.vdi" 
Exit Code: -2135228409
Output:
VBoxManage.exe: error: Cannot attach medium 'C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_04_03_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

2025-04-15 19:58:15 (1704): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_03_prod.vdi" 
Exit Code: 0
Output:
UUID:           1e3cee35-4ed8-40c2-9108-b352bcb83c50
Parent UUID:    base
State:          created
Type:           multiattach
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_04_03_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       10240 MBytes
Size on disk:   2429 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-04-15 19:58:15 (1704): 
Command: VBoxManage -q closemedium disk "C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_04_03_prod.vdi" 
Exit Code: 0
Output:

2025-04-15 19:58:15 (1704): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_03_prod.vdi" 
Exit Code: 0
Output:
UUID:           1e3cee35-4ed8-40c2-9108-b352bcb83c50
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_04_03_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       10240 MBytes
Size on disk:   2429 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-04-15 19:58:15 (1704): 
Command: VBoxManage -q storageattach "boinc_e3b4b1ea38a0e4ae" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_03_prod.vdi" 
Exit Code: 0
Output:

2025-04-15 19:58:16 (1704): 
Command: VBoxManage -q storageattach "boinc_e3b4b1ea38a0e4ae" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2025-04-15 19:58:16 (1704): 
Command: VBoxManage -q storageattach "boinc_e3b4b1ea38a0e4ae" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_03_prod.vdi" 
Exit Code: 0
Output:

2025-04-15 19:58:16 (1704): 
Command: VBoxManage -q storageattach "boinc_e3b4b1ea38a0e4ae" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-04-15 19:58:17 (1704): 
Command: VBoxManage -q bandwidthctl "boinc_e3b4b1ea38a0e4ae" add "boinc_e3b4b1ea38a0e4ae_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-04-15 19:58:17 (1704): 
Command: VBoxManage -q modifyvm "boinc_e3b4b1ea38a0e4ae" --natpf1 ",tcp,127.0.0.1,52138,,80" 
Exit Code: 0
Output:

2025-04-15 19:58:17 (1704): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-04-15 19:58:17 (1704): 
Command: VBoxManage -q sharedfolder add "boinc_e3b4b1ea38a0e4ae" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\5/shared"
Exit Code: 0
Output:

2025-04-15 19:58:23 (1704): 
Command: VBoxManage -q startvm "boinc_e3b4b1ea38a0e4ae" --type headless
Exit Code: -2147467259
Output:
VBoxManage.exe: error: Not in a hypervisor partition (HVP=0) (VERR_NEM_NOT_AVAILABLE).
VBoxManage.exe: error: VT-x is disabled in the BIOS for all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole
Waiting for VM "boinc_e3b4b1ea38a0e4ae" to power on...

2025-04-15 19:58:23 (1704): 
Command: VBoxManage -q snapshot "boinc_e3b4b1ea38a0e4ae" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-04-15 19:58:23 (1704): 
Command: VBoxManage -q bandwidthctl "boinc_e3b4b1ea38a0e4ae" remove "boinc_e3b4b1ea38a0e4ae_net" 
Exit Code: 0
Output:

2025-04-15 19:58:23 (1704): 
Command: VBoxManage -q unregistervm "boinc_e3b4b1ea38a0e4ae" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

2025-04-15 19:58:29 (1704): called boinc_finish(-2147467259)

</stderr_txt>
]]>

©2025 CERN