Stderr output

<core_client_version>8.0.2</core_client_version>
<![CDATA[
<message>
Unspecified error
 (0x80004005) - exit code 2147500037 (0x80004005)</message>
<stderr_txt>
2025-04-26 12:07:09 (11984): Detected: vboxwrapper 26206
2025-04-26 12:07:09 (11984): Detected: BOINC client v8.0.2
2025-04-26 12:07:10 (11984): Detected: VirtualBox VboxManage Interface (Version: 7.0.6)
2025-04-26 12:07:10 (11984): Successfully copied 'init_data.xml' to the shared directory.
2025-04-26 12:07:11 (11984): Create VM. (boinc_9cf9082a964a1ebc, slot#0)
2025-04-26 12:07:11 (11984): Setting Memory Size for VM. (4600MB)
2025-04-26 12:07:11 (11984): Setting CPU Count for VM. (6)
2025-04-26 12:07:12 (11984): Setting Chipset Options for VM.
2025-04-26 12:07:12 (11984): Setting Graphics Controller Options for VM.
2025-04-26 12:07:12 (11984): Setting Boot Options for VM.
2025-04-26 12:07:12 (11984): Setting Network Configuration for NAT.
2025-04-26 12:07:13 (11984): Enabling VM Network Access.
2025-04-26 12:07:13 (11984): Disabling USB Support for VM.
2025-04-26 12:07:13 (11984): Disabling COM Port Support for VM.
2025-04-26 12:07:14 (11984): Disabling LPT Port Support for VM.
2025-04-26 12:07:14 (11984): Disabling Audio Support for VM.
2025-04-26 12:07:14 (11984): Disabling Clipboard Support for VM.
2025-04-26 12:07:14 (11984): Disabling Drag and Drop Support for VM.
2025-04-26 12:07:15 (11984): Adding storage controller(s) to VM.
2025-04-26 12:07:15 (11984): Adding virtual disk drive to VM. (ATLAS_vbox_3.01_image.vdi)
2025-04-26 12:07:18 (11984): Adding VirtualBox Guest Additions to VM.
2025-04-26 12:07:18 (11984): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-04-26 12:07:18 (11984): forwarding host port 56778 to guest port 80
2025-04-26 12:07:19 (11984): Enabling remote desktop for VM.
2025-04-26 12:07:19 (11984): Required extension pack not installed, remote desktop not enabled.
2025-04-26 12:07:19 (11984): Enabling shared directory for VM.
2025-04-26 12:07:19 (11984): Starting VM using VBoxManage interface. (boinc_9cf9082a964a1ebc, slot#0)
2025-04-26 12:07:23 (11984): Error in start VM for VM: -2147467259
Command:
VBoxManage -q startvm "boinc_9cf9082a964a1ebc" --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_9cf9082a964a1ebc" to power on...

2025-04-26 12:07:23 (11984): VM failed to start.
2025-04-26 12:07:23 (11984): Could not start 
2025-04-26 12:07:23 (11984): ERROR: VM failed to start
2025-04-26 12:07:23 (11984): Powering off VM.
2025-04-26 12:07:23 (11984): Deregistering VM. (boinc_9cf9082a964a1ebc, slot#0)
2025-04-26 12:07:23 (11984): Removing network bandwidth throttle group from VM.
2025-04-26 12:07:23 (11984): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:06.094416          Finished saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml"
00:00:07.641286          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
00:00:07.641643          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
00:00:07.641808          Saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:07.643975          Finished saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml"
00:00:07.644276          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox" with version "1.19-windows"
00:00:07.645861          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox"
00:00:07.906863          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox" with version "1.19-windows"
00:00:07.908837          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox"
00:00:08.171566          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
00:00:08.172144          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox" with version "1.19-windows"
00:00:08.173975          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox"
00:00:08.174087          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
00:00:08.175431          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox" with version "1.19-windows"
00:00:08.177104          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox"
00:00:08.177447          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox" with version "1.19-windows"
00:00:08.179441          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox"
00:00:08.438782          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
00:00:08.439879          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
00:00:08.440019          Saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:08.442403          Finished saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml"
00:00:08.442590          Saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:08.444640          Finished saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml"
00:00:08.444886          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox" with version "1.19-windows"
00:00:08.446811          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox"
00:00:08.704277          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox" with version "1.19-windows"
00:00:08.706052          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox"
00:00:08.970217          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox" with version "1.19-windows"
00:00:08.972056          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox"
00:00:09.501852          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox" with version "1.19-windows"
00:00:09.503751          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox"
00:00:09.765487          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
00:00:09.771673          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
00:00:09.771749          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
00:00:09.779247          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
00:00:10.032480          Launched VM: 524757296 pid: 3412 (0xd54) frontend: headless name: boinc_9cf9082a964a1ebc
00:00:13.435899          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox" with version "1.19-windows"
00:00:13.437862          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox"
00:00:13.481178          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
00:00:13.770596          ERROR [COM]: aRC=VBOX_E_INVALID_OBJECT_STATE (0x80bb0007) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={Cannot unregister the machine 'boinc_9cf9082a964a1ebc' while it is locked}, preserve=false aResultDetail=0
00:00:15.044416          Saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:15.046357          Finished saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml"
00:00:15.046453          Saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:15.048211          Finished saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml"
00:00:15.048841 DeleteVM Saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:15.050868 DeleteVM Finished saving settings file "C:\Users\Student\.VirtualBox\VirtualBox.xml"
00:00:20.053216 main     VirtualBox: object deletion starts
00:00:20.053847 main     HostDnsMonitor: shutting down ...
00:00:20.053874 main     HostDnsMonitor: shut down
00:00:20.054972 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
00:00:20.055159 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

a\BOINC\slots\0" --ostype "Linux26_64" --register
Exit Code: 0
Output:
Virtual machine 'boinc_9cf9082a964a1ebc' is created and registered.
UUID: 725b4d1a-7b41-4ec8-9c16-fb8e3148147b
Settings file: 'C:\ProgramData\BOINC\slots\0\boinc_9cf9082a964a1ebc\boinc_9cf9082a964a1ebc.vbox'

2025-04-26 12:07:11 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --description "TIMODmMnuS7nsSi4ap6QjLDmwznN0nGgGQJmkKkKDmYbqLDmU0YRXn_0" 
Exit Code: 0
Output:

2025-04-26 12:07:11 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --memory 4600 
Exit Code: 0
Output:

2025-04-26 12:07:12 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --cpus 6 
Exit Code: 0
Output:

2025-04-26 12:07:12 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2025-04-26 12:07:12 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2025-04-26 12:07:12 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2025-04-26 12:07:13 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --nic1 nat --natdnsproxy1 on --cableconnected1 off 
Exit Code: 0
Output:

2025-04-26 12:07:13 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --cableconnected1 on 
Exit Code: 0
Output:

2025-04-26 12:07:13 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --usb off 
Exit Code: 0
Output:

2025-04-26 12:07:14 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-04-26 12:07:14 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-04-26 12:07:14 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --audio none 
Exit Code: 0
Output:
Warning: --audio is deprecated and will be removed soon. Use --audio-driver instead!

2025-04-26 12:07:14 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --clipboard disabled 
Exit Code: 0
Output:

2025-04-26 12:07:15 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --draganddrop disabled 
Exit Code: 0
Output:

2025-04-26 12:07:15 (11984): 
Command: VBoxManage -q storagectl "boinc_9cf9082a964a1ebc" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-04-26 12:07:15 (11984): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:
UUID:           ba4f7346-8ee8-4da6-a071-5ab41c7f9cb8
Parent UUID:    base
State:          created
Type:           multiattach
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.01_image.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   4204 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-04-26 12:07:15 (11984): 
Command: VBoxManage -q storageattach "boinc_9cf9082a964a1ebc" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: -2135228409
Output:
VBoxManage.exe: error: Cannot attach medium 'C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.01_image.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

2025-04-26 12:07:16 (11984): 
Command: VBoxManage -q closemedium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:

2025-04-26 12:07:17 (11984): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:
UUID:           ba4f7346-8ee8-4da6-a071-5ab41c7f9cb8
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.01_image.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   4204 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-04-26 12:07:17 (11984): 
Command: VBoxManage -q storageattach "boinc_9cf9082a964a1ebc" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:

2025-04-26 12:07:17 (11984): 
Command: VBoxManage -q storageattach "boinc_9cf9082a964a1ebc" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2025-04-26 12:07:18 (11984): 
Command: VBoxManage -q storageattach "boinc_9cf9082a964a1ebc" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:

2025-04-26 12:07:18 (11984): 
Command: VBoxManage -q storageattach "boinc_9cf9082a964a1ebc" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-04-26 12:07:18 (11984): 
Command: VBoxManage -q bandwidthctl "boinc_9cf9082a964a1ebc" add "boinc_9cf9082a964a1ebc_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-04-26 12:07:19 (11984): 
Command: VBoxManage -q modifyvm "boinc_9cf9082a964a1ebc" --natpf1 ",tcp,127.0.0.1,56778,,80" 
Exit Code: 0
Output:

2025-04-26 12:07:19 (11984): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-04-26 12:07:19 (11984): 
Command: VBoxManage -q sharedfolder add "boinc_9cf9082a964a1ebc" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\0/shared"
Exit Code: 0
Output:

2025-04-26 12:07:23 (11984): 
Command: VBoxManage -q startvm "boinc_9cf9082a964a1ebc" --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_9cf9082a964a1ebc" to power on...

2025-04-26 12:07:23 (11984): 
Command: VBoxManage -q snapshot "boinc_9cf9082a964a1ebc" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-04-26 12:07:23 (11984): 
Command: VBoxManage -q bandwidthctl "boinc_9cf9082a964a1ebc" remove "boinc_9cf9082a964a1ebc_net" 
Exit Code: 0
Output:
VBoxManage.exe: error: Bandwidth groups cannot be deleted while the VM is running

2025-04-26 12:07:23 (11984): 
Command: VBoxManage -q unregistervm "boinc_9cf9082a964a1ebc" --delete 
Exit Code: -2135228409
Output:
VBoxManage.exe: error: Cannot unregister the machine 'boinc_9cf9082a964a1ebc' while it is locked
VBoxManage.exe: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component MachineWrap, interface IMachine, callee IUnknown
VBoxManage.exe: error: Context: "Unregister(fDeleteAll ? CleanupMode_DetachAllReturnHardDisksAndVMRemovable :CleanupMode_DetachAllReturnHardDisksOnly, ComSafeArrayAsOutParam(aMedia))" at line 236 of file VBoxManageMisc.cpp

2025-04-26 12:07:25 (11984): 
Command: VBoxManage -q unregistervm "boinc_9cf9082a964a1ebc" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

12:07:30 (11984): called boinc_finish(-2147467259)

</stderr_txt>
]]>

©2025 CERN