Stderr output

<core_client_version>8.2.5</core_client_version>
<![CDATA[
<message>
process exited with code 5 (0x5, -251)</message>
<stderr_txt>
2025-11-24 01:07:15 (39443): vboxwrapper version 26210
2025-11-24 01:07:15 (39443): BOINC client version: 8.2.5
2025-11-24 01:07:15 (39443): Detected: VirtualBox VboxManage Interface (Version: 7.1.8)
2025-11-24 01:07:15 (39443): Detected: Sandbox Configuration Enabled
2025-11-24 01:07:15 (39443): Successfully copied 'init_data.xml' to the shared directory.
2025-11-24 01:07:15 (39443): Create VM. (boinc_e3eab7bd5b9dd662, slot#1)
2025-11-24 01:07:15 (39443): Setting Memory Size for VM. (4400MB)
2025-11-24 01:07:15 (39443): Setting CPU Count for VM. (4)
2025-11-24 01:07:15 (39443): Setting Chipset Options for VM.
2025-11-24 01:07:15 (39443): Setting Graphics Controller Options for VM. (Driver: VBoxVGA, 16MB)
2025-11-24 01:07:15 (39443): Setting Boot Options for VM.
2025-11-24 01:07:15 (39443): Setting Network Configuration for NAT. (Driver: virtio)
2025-11-24 01:07:15 (39443): Enabling VM Network Access.
2025-11-24 01:07:15 (39443): Disabling USB Support for VM.
2025-11-24 01:07:15 (39443): Disabling COM Port Support for VM.
2025-11-24 01:07:15 (39443): Disabling Audio Support for VM.
2025-11-24 01:07:15 (39443): Disabling Clipboard Support for VM.
2025-11-24 01:07:15 (39443): Disabling Drag and Drop Support for VM.
2025-11-24 01:07:15 (39443): Adding storage controller(s) to VM.
2025-11-24 01:07:15 (39443): Adding virtual disk drive to VM. (ATLAS_vbox_3.03_image.vdi)
2025-11-24 01:07:16 (39443): Adding VirtualBox Guest Additions to VM.
2025-11-24 01:07:16 (39443): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-11-24 01:07:16 (39443): forwarding host port 60306 to guest port 80
2025-11-24 01:07:16 (39443): Enabling remote desktop for VM.
2025-11-24 01:07:16 (39443): Required extension pack not installed, remote desktop not enabled.
2025-11-24 01:07:16 (39443): Enabling shared directory for VM.
2025-11-24 01:07:16 (39443): Starting VM using VBoxManage interface. (boinc_e3eab7bd5b9dd662, slot#1)
2025-11-24 01:07:16 (39443): Error in start VM for VM: -2147467259
Command:
VBoxManage -q startvm "boinc_e3eab7bd5b9dd662" --type headless
Output:
VBoxManage: error: The VM session was aborted
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component SessionMachine, interface ISession
Waiting for VM "boinc_e3eab7bd5b9dd662" to power on...

2025-11-24 01:07:16 (39443): VM failed to start.
2025-11-24 01:07:16 (39443): Could not start 
2025-11-24 01:07:16 (39443): ERROR: VM failed to start
2025-11-24 01:07:16 (39443): Powering off VM.
2025-11-24 01:07:16 (39443): Deregistering VM. (boinc_e3eab7bd5b9dd662, slot#1)
2025-11-24 01:07:16 (39443): Removing network bandwidth throttle group from VM.
2025-11-24 01:07:16 (39443): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:00.806736 DCon03   Finished saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox"
00:00:00.823973 DCon03   Platform architecture set to 'x86'
00:00:00.824980 DCon03   ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:00.825278 DCon03   Saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox" with version "1.19-macosx"
00:00:00.826006 DCon03   Finished saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox"
00:00:00.826083 DCon03   ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:00.827252 DCon03   Saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox" with version "1.19-macosx"
00:00:00.828017 DCon03   Finished saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox"
00:00:00.828153 DCon03   Saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox" with version "1.19-macosx"
00:00:00.828826 DCon03   Finished saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox"
00:00:00.847986 DCon02   Platform architecture set to 'x86'
00:00:00.849025 DCon02   ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:00.850941 DCon02   ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:00.851050 DCon02   Saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml" with version "1.12-macosx"
00:00:00.851907 DCon02   Finished saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml"
00:00:00.851988 DCon02   Saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml" with version "1.12-macosx"
00:00:00.852553 DCon02   Finished saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml"
00:00:00.852678 DCon02   Saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox" with version "1.19-macosx"
00:00:00.853238 DCon02   Finished saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox"
00:00:00.870071 DCon02   Platform architecture set to 'x86'
00:00:00.870747 DCon02   Saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox" with version "1.19-macosx"
00:00:00.871445 DCon02   Finished saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox"
00:00:00.889714 DCon02   Platform architecture set to 'x86'
00:00:00.890653 DCon02   Saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox" with version "1.19-macosx"
00:00:00.891346 DCon02   Finished saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox"
00:00:00.925968 DCon02   Platform architecture set to 'x86'
00:00:00.926552 DCon02   Saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox" with version "1.19-macosx"
00:00:00.927282 DCon02   Finished saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox"
00:00:00.943482 DCon02   Platform architecture set to 'x86'
00:00:00.944296 DCon02   ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={d644ad1e-c501-4fc7-9ab6-aa6d763bc540} aComponent={VirtualBoxWrap} aText={&#197;&#131;o extension pack providing a cryptographic support module could be found}, preserve=false aResultDetail=0
00:00:00.949473 DCon02   ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:00.949560 DCon02   ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:00.953799 DCon02   ERROR [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={bea3ef5c-de2f-4b74-aa3a-15d6249371a0} aComponent={RecordingSettingsWrap} aText={Recording not started}, preserve=false aResultDetail=0
00:00:00.954552 DCon02   ERROR [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
00:00:00.971082 DCon02   Launched VM: 39699728 pid: 39517 (0x9a5d) frontend: headless name: boinc_e3eab7bd5b9dd662
00:00:00.982015 DCon03   Platform architecture set to 'x86'
00:00:00.984046 DCon03   ERROR [COM]: aRC=VBOX_E_VM_ERROR (0x80bb0003) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={Failed to assign the machine to the session (VBOX_E_PLATFORM_ARCH_NOT_SUPPORTED)}, preserve=false aResultDetail=0
00:00:00.984154 DCon01   Saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox" with version "1.19-macosx"
00:00:00.984755 DCon01   Finished saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox"
00:00:01.001957 DCon02   Platform architecture set to 'x86'
00:00:01.002272 Watcher  Reaper: Pid 39517 (0x9a5d) exited normally: 1 (0x1)
00:00:01.002457 DCon02   ERROR [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
00:00:01.019799 DCon02   Platform architecture set to 'x86'
00:00:01.020399 DCon02   Saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox" with version "1.19-macosx"
00:00:01.021076 DCon02   Finished saving settings file "/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662.vbox"
00:00:01.037747 DCon02   Saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml" with version "1.12-macosx"
00:00:01.038479 DCon02   Finished saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml"
00:00:01.038494 DCon02   Saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml" with version "1.12-macosx"
00:00:01.039072 DCon02   Finished saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml"
00:00:01.039328 DeleteVM Saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml" with version "1.12-macosx"
00:00:01.039825 DeleteVM Finished saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml"

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

rtcuseutc="on"
iommu="none"
paravirtprovider="default"
effparavirtprovider="kvm"
VMState="poweroff"
VMStateChangeTime="2025-11-24T09:07:15.376000000"
graphicscontroller="vboxvga"
monitorcount=1
accelerate3d="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="0800274A2A1F"
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_started="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="/Library/Application Support/BOINC Data/slots/1/boinc_e3eab7bd5b9dd662/boinc_e3eab7bd5b9dd662-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="patMDm6sOh8nsSi4ap6QjLDmwznN0nGgGQJmNLGKDmeuKKDmrbxgtn_1"
GuestMemoryBalloon=0

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q modifyvm "boinc_e3eab7bd5b9dd662" --nic1 nat --nic-type1 "virtio" --cable-connected1 off --nat-dns-proxy1 on 
Exit Code: 0
Output:

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q modifyvm "boinc_e3eab7bd5b9dd662" --cable-connected1 on 
Exit Code: 0
Output:

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q modifyvm "boinc_e3eab7bd5b9dd662" --usb off 
Exit Code: 0
Output:

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q modifyvm "boinc_e3eab7bd5b9dd662" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q modifyvm "boinc_e3eab7bd5b9dd662" --audio-enabled off 
Exit Code: 0
Output:

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q modifyvm "boinc_e3eab7bd5b9dd662" --clipboard disabled 
Exit Code: 0
Output:

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q modifyvm "boinc_e3eab7bd5b9dd662" --draganddrop disabled 
Exit Code: 0
Output:

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q storagectl "boinc_e3eab7bd5b9dd662" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q showhdinfo "/Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:
UUID:           3e56213b-898f-4e83-899f-8eb541d45260
Parent UUID:    base
State:          created
Type:           multiattach
Location:       /Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   4204 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q storageattach "boinc_e3eab7bd5b9dd662" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "/Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: -2135228409
Output:
VBoxManage: error: Cannot attach medium '/Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi': the media type 'MultiAttach' can only be attached to machines that were created with VirtualBox 4.0 or later
VBoxManage: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component SessionMachine, interface IMachine, callee nsISupports
VBoxManage: error: Context: "AttachDevice(Bstr(pszCtl).raw(), port, device, DeviceType_HardDisk, pMedium2Mount)" at line 786 of file VBoxManageStorageController.cpp

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q showhdinfo "/Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:
UUID:           3e56213b-898f-4e83-899f-8eb541d45260
Parent UUID:    base
State:          created
Type:           multiattach
Location:       /Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   4204 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q closemedium disk "/Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:

2025-11-24 01:07:15 (39443): 
Command: VBoxManage -q showhdinfo "/Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:
UUID:           3e56213b-898f-4e83-899f-8eb541d45260
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       /Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   4204 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q storageattach "boinc_e3eab7bd5b9dd662" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "/Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q storageattach "boinc_e3eab7bd5b9dd662" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q storageattach "boinc_e3eab7bd5b9dd662" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "/Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q storageattach "boinc_e3eab7bd5b9dd662" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q bandwidthctl "boinc_e3eab7bd5b9dd662" add "boinc_e3eab7bd5b9dd662_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q modifyvm "boinc_e3eab7bd5b9dd662" --natpf1 ",tcp,127.0.0.1,60306,,80" 
Exit Code: 0
Output:

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q sharedfolder add "boinc_e3eab7bd5b9dd662" --name "shared" --hostpath "/Library/Application Support/BOINC Data/slots/1/shared"
Exit Code: 0
Output:

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q startvm "boinc_e3eab7bd5b9dd662" --type headless
Exit Code: -2147467259
Output:
VBoxManage: error: The VM session was aborted
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component SessionMachine, interface ISession
Waiting for VM "boinc_e3eab7bd5b9dd662" to power on...

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q snapshot "boinc_e3eab7bd5b9dd662" list 
Exit Code: 0
Output:
This machine does not have any snapshots

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q bandwidthctl "boinc_e3eab7bd5b9dd662" remove "boinc_e3eab7bd5b9dd662_net" 
Exit Code: 0
Output:

2025-11-24 01:07:16 (39443): 
Command: VBoxManage -q unregistervm "boinc_e3eab7bd5b9dd662" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

2025-11-24 01:07:21 (39443): called boinc_finish(-2147467259)

</stderr_txt>
]]>

©2025 CERN