Stderr output

<core_client_version>8.2.4</core_client_version>
<![CDATA[
<message>
Incorrect function.
 (0x1) - exit code 1 (0x1)</message>
<stderr_txt>
2025-07-23 00:09:49 (4780): vboxwrapper version 26210
2025-07-23 00:09:49 (4780): BOINC client version: 8.2.4
2025-07-23 00:09:50 (4780): Detected: VirtualBox VboxManage Interface (Version: 7.0.6)
2025-07-23 00:09:50 (4780): Detected: Heartbeat check (file: 'heartbeat' every 1800.000000 seconds)
2025-07-23 00:09:50 (4780): Successfully copied 'init_data.xml' to the shared directory.
2025-07-23 00:09:50 (4780): Successfully copied 'input' to the shared directory.
2025-07-23 00:09:51 (4780): Create VM. (boinc_547ba028ed1ce386, slot#10)
2025-07-23 00:09:51 (4780): Setting Memory Size for VM. (630MB)
2025-07-23 00:09:51 (4780): Setting CPU Count for VM. (1)
2025-07-23 00:09:52 (4780): Setting Chipset Options for VM.
2025-07-23 00:09:52 (4780): Setting Graphics Controller Options for VM. (Driver: VBoxVGA, 16MB)
2025-07-23 00:09:52 (4780): Setting Boot Options for VM.
2025-07-23 00:09:53 (4780): Setting Network Configuration for NAT. (Driver: virtio)
2025-07-23 00:09:53 (4780): Enabling VM Network Access.
2025-07-23 00:09:53 (4780): Disabling USB Support for VM.
2025-07-23 00:09:54 (4780): Disabling COM Port Support for VM.
2025-07-23 00:09:54 (4780): Disabling LPT Port Support for VM.
2025-07-23 00:09:54 (4780): Disabling Audio Support for VM.
2025-07-23 00:09:54 (4780): Disabling Clipboard Support for VM.
2025-07-23 00:09:55 (4780): Disabling Drag and Drop Support for VM.
2025-07-23 00:09:55 (4780): Adding storage controller(s) to VM.
2025-07-23 00:09:55 (4780): Adding virtual disk drive to VM. (Theory_2025_07_03_prod.vdi)
2025-07-23 00:09:57 (4780): Attempts: 2
2025-07-23 00:09:58 (4780): Adding VirtualBox Guest Additions to VM.
2025-07-23 00:09:58 (4780): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-07-23 00:09:58 (4780): forwarding host port 59400 to guest port 80
2025-07-23 00:09:58 (4780): Enabling remote desktop for VM.
2025-07-23 00:09:59 (4780): Required extension pack not installed, remote desktop not enabled.
2025-07-23 00:09:59 (4780): Enabling shared directory for VM.
2025-07-23 00:09:59 (4780): Starting VM using VBoxManage interface. (boinc_547ba028ed1ce386, slot#10)
2025-07-23 00:10:01 (4780): Error in start VM for VM: 1
Command:
VBoxManage -q startvm "boinc_547ba028ed1ce386" --type headless
Output:
VBoxManage.exe: error: The virtual machine 'boinc_547ba028ed1ce386' has terminated unexpectedly during startup with exit code 1 (0x1).  More details may be available in 'C:\ProgramData\BOINC\slots\10\boinc_547ba028ed1ce386\Logs\VBoxHardening.log'
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine
Waiting for VM "boinc_547ba028ed1ce386" to power on...

2025-07-23 00:10:01 (4780): VM failed to start.
2025-07-23 00:10:01 (4780): Could not start 
2025-07-23 00:10:01 (4780): ERROR: VM failed to start
2025-07-23 00:10:01 (4780): Powering off VM.
2025-07-23 00:10:01 (4780): Deregistering VM. (boinc_547ba028ed1ce386, slot#10)
2025-07-23 00:10:01 (4780): Removing network bandwidth throttle group from VM.
2025-07-23 00:10:06 (4780): Attempts: 4
2025-07-23 00:10:06 (4780): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:02.633801          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633817          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633833          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633849          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633865          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633881          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633896          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633912          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633928          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633945          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633962          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633978          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.633994          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634010          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634026          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634041          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634057          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634073          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634089          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634104          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634120          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634136          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634152          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634167          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634183          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634198          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634214          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634230          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634248          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634265          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634281          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634296          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634312          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634328          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634344          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634360          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:02.634380          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={7682d5eb-f00e-44f1-8ca2-99d08b1cd607} aComponent={VirtualBoxWrap} aText={Could not find a registered machine named 'boinc_6f9490beda2c1919'}, preserve=false aResultDetail=0

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

_64" --register
Exit Code: 0
Output:
Virtual machine 'boinc_547ba028ed1ce386' is created and registered.
UUID: e8747be1-7866-4fe1-9af2-b2e9495cfb7e
Settings file: 'C:\ProgramData\BOINC\slots\10\boinc_547ba028ed1ce386\boinc_547ba028ed1ce386.vbox'

2025-07-23 00:09:51 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --description "Theory_2922-4882796-98_0" 
Exit Code: 0
Output:

2025-07-23 00:09:51 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --memory 630 
Exit Code: 0
Output:

2025-07-23 00:09:52 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --cpus 1 
Exit Code: 0
Output:

2025-07-23 00:09:52 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2025-07-23 00:09:52 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2025-07-23 00:09:52 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2025-07-23 00:09:53 (4780): 
Command: VBoxManage -q showvminfo "boinc_547ba028ed1ce386" --machinereadable 
Exit Code: 0
Output:
name="boinc_547ba028ed1ce386"
Encryption:     disabled
groups="/"
ostype="Linux 2.6 / 3.x / 4.x / 5.x (64-bit)"
UUID="e8747be1-7866-4fe1-9af2-b2e9495cfb7e"
CfgFile="C:\\ProgramData\\BOINC\\slots\\10\\boinc_547ba028ed1ce386\\boinc_547ba028ed1ce386.vbox"
SnapFldr="C:\\ProgramData\\BOINC\\slots\\10\\boinc_547ba028ed1ce386\\Snapshots"
LogFldr="C:\\ProgramData\\BOINC\\slots\\10\\boinc_547ba028ed1ce386\\Logs"
hardwareuuid="e8747be1-7866-4fe1-9af2-b2e9495cfb7e"
memory=630
pagefusion="off"
vram=16
cpuexecutioncap=100
hpet="off"
cpu-profile="host"
chipset="piix3"
firmware="BIOS"
cpus=1
pae="on"
longmode="on"
triplefaultreset="off"
apic="on"
x2apic="on"
nested-hw-virt="off"
cpuid-portability-level=0
bootmenu="messageandmenu"
boot1="disk"
boot2="dvd"
boot3="none"
boot4="none"
acpi="on"
ioapic="on"
biosapic="apic"
biossystemtimeoffset=0
BIOS NVRAM File="C:\\ProgramData\\BOINC\\slots\\10\\boinc_547ba028ed1ce386\\boinc_547ba028ed1ce386.nvram"
rtcuseutc="off"
hwvirtex="on"
nestedpaging="on"
largepages="on"
vtxvpid="on"
vtxux="on"
virtvmsavevmload="on"
iommu="none"
paravirtprovider="default"
effparavirtprovider="kvm"
VMState="poweroff"
VMStateChangeTime="2025-07-22T16:09:51.191000000"
graphicscontroller="vboxvga"
monitorcount=1
accelerate3d="off"
accelerate2dvideo="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="0800270E47D6"
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\\10\\boinc_547ba028ed1ce386\\boinc_547ba028ed1ce386-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_2922-4882796-98_0"
GuestMemoryBalloon=0

2025-07-23 00:09:53 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --nic1 nat --nic-type1 "virtio" --cable-connected1 off --nat-dns-proxy1 on 
Exit Code: 0
Output:

2025-07-23 00:09:53 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --cable-connected1 on 
Exit Code: 0
Output:

2025-07-23 00:09:54 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --usb off 
Exit Code: 0
Output:

2025-07-23 00:09:54 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-07-23 00:09:54 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-07-23 00:09:54 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --audio-enabled off 
Exit Code: 0
Output:

2025-07-23 00:09:55 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --clipboard disabled 
Exit Code: 0
Output:

2025-07-23 00:09:55 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --draganddrop disabled 
Exit Code: 0
Output:

2025-07-23 00:09:55 (4780): 
Command: VBoxManage -q storagectl "boinc_547ba028ed1ce386" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-07-23 00:09:57 (4780): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_07_03_prod.vdi" 
Exit Code: 0
Output:
UUID:           93ef7340-8636-46d8-8751-a7cb0c80413d
Parent UUID:    base
State:          created
Type:           multiattach
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_07_03_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       10240 MBytes
Size on disk:   2847 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576
Child UUIDs:    4d8dfaf9-55c2-49fe-82f8-6ce3006ae349
                c402e3d1-90e1-404c-ac31-f8a2d6406f5d

2025-07-23 00:09:58 (4780): 
Command: VBoxManage -q storageattach "boinc_547ba028ed1ce386" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_07_03_prod.vdi" 
Exit Code: 0
Output:

2025-07-23 00:09:58 (4780): 
Command: VBoxManage -q storageattach "boinc_547ba028ed1ce386" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-07-23 00:09:58 (4780): 
Command: VBoxManage -q bandwidthctl "boinc_547ba028ed1ce386" add "boinc_547ba028ed1ce386_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-07-23 00:09:58 (4780): 
Command: VBoxManage -q modifyvm "boinc_547ba028ed1ce386" --natpf1 ",tcp,127.0.0.1,59400,,80" 
Exit Code: 0
Output:

2025-07-23 00:09:59 (4780): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-07-23 00:09:59 (4780): 
Command: VBoxManage -q sharedfolder add "boinc_547ba028ed1ce386" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\10/shared"
Exit Code: 0
Output:

2025-07-23 00:10:01 (4780): 
Command: VBoxManage -q startvm "boinc_547ba028ed1ce386" --type headless
Exit Code: 1
Output:
VBoxManage.exe: error: The virtual machine 'boinc_547ba028ed1ce386' has terminated unexpectedly during startup with exit code 1 (0x1).  More details may be available in 'C:\ProgramData\BOINC\slots\10\boinc_547ba028ed1ce386\Logs\VBoxHardening.log'
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine
Waiting for VM "boinc_547ba028ed1ce386" to power on...

2025-07-23 00:10:01 (4780): 
Command: VBoxManage -q snapshot "boinc_547ba028ed1ce386" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-07-23 00:10:01 (4780): 
Command: VBoxManage -q bandwidthctl "boinc_547ba028ed1ce386" remove "boinc_547ba028ed1ce386_net" 
Exit Code: 0
Output:

2025-07-23 00:10:06 (4780): 
Command: VBoxManage -q unregistervm "boinc_547ba028ed1ce386" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

2025-07-23 00:10:16 (4780): called boinc_finish(1)

</stderr_txt>
]]>

©2025 CERN