Stderr output

<core_client_version>8.0.2</core_client_version>
<![CDATA[
<message>
(unknown error) (317) - exit code 3221225477 (0xc0000005)</message>
<stderr_txt>
2025-07-11 20:16:05 (1540): Detected: vboxwrapper 26206
2025-07-11 20:16:05 (1540): Detected: BOINC client v8.0.2
2025-07-11 20:16:05 (1540): Detected: VirtualBox VboxManage Interface (Version: 5.2.8)
2025-07-11 20:16:06 (1540): Successfully copied 'init_data.xml' to the shared directory.
2025-07-11 20:16:06 (1540): Create VM. (boinc_d5faec8bbe409dd4, slot#3)
2025-07-11 20:16:07 (1540): Setting Memory Size for VM. (4800MB)
2025-07-11 20:16:07 (1540): Setting CPU Count for VM. (8)
2025-07-11 20:16:07 (1540): Setting Chipset Options for VM.
2025-07-11 20:16:08 (1540): Setting Graphics Controller Options for VM.
2025-07-11 20:16:08 (1540): Setting Boot Options for VM.
2025-07-11 20:16:08 (1540): Setting Network Configuration for NAT.
2025-07-11 20:16:08 (1540): Enabling VM Network Access.
2025-07-11 20:16:09 (1540): Disabling USB Support for VM.
2025-07-11 20:16:09 (1540): Disabling COM Port Support for VM.
2025-07-11 20:16:09 (1540): Disabling LPT Port Support for VM.
2025-07-11 20:16:09 (1540): Disabling Audio Support for VM.
2025-07-11 20:16:10 (1540): Disabling Clipboard Support for VM.
2025-07-11 20:16:10 (1540): Disabling Drag and Drop Support for VM.
2025-07-11 20:16:10 (1540): Adding storage controller(s) to VM.
2025-07-11 20:16:10 (1540): Adding virtual disk drive to VM. (ATLAS_vbox_3.01_image.vdi)
2025-07-11 20:16:12 (1540): Adding VirtualBox Guest Additions to VM.
2025-07-11 20:16:12 (1540): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-07-11 20:16:12 (1540): forwarding host port 9739 to guest port 80
2025-07-11 20:16:12 (1540): Enabling remote desktop for VM.
2025-07-11 20:16:13 (1540): Required extension pack not installed, remote desktop not enabled.
2025-07-11 20:16:13 (1540): Enabling shared directory for VM.
2025-07-11 20:16:13 (1540): Starting VM using VBoxManage interface. (boinc_d5faec8bbe409dd4, slot#3)
2025-07-11 20:16:15 (1540): Error in start VM for VM: -1073741819
Command:
VBoxManage -q startvm "boinc_d5faec8bbe409dd4" --type headless
Output:
Waiting for VM "boinc_d5faec8bbe409dd4" to power on...
VBoxManage.exe: error: The virtual machine 'boinc_d5faec8bbe409dd4' has terminated unexpectedly during startup with exit code -1073741819 (0xc0000005)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine

2025-07-11 20:16:15 (1540): VM failed to start.
2025-07-11 20:16:15 (1540): Could not start 
2025-07-11 20:16:15 (1540): ERROR: VM failed to start
2025-07-11 20:16:15 (1540): Powering off VM.
2025-07-11 20:16:15 (1540): Deregistering VM. (boinc_d5faec8bbe409dd4, slot#3)
2025-07-11 20:16:15 (1540): Removing network bandwidth throttle group from VM.
2025-07-11 20:16:15 (1540): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:01.042185          ERROR [COM]: aRC=VBOX_E_FILE_ERROR (0x80bb0004) aIID={4afe423b-43e0-e9d0-82e8-ceb307940dda} aComponent={MediumWrap} aText={Could not find file for the medium 'C:\ProgramData\BOINC\slots\3\vm_image.vdi' (VERR_FILE_NOT_FOUND)}, preserve=false aResultDetail=0
00:00:01.318201          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:01.322209          Saving settings file "C:\Users\43650\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:01.572113          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:01.884623          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:02.172489          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:02.422327          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:02.692488          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:02.934927          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:03.235281          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:03.467699          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:03.722011          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:04.000129          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:04.250210          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:04.522017          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:04.772280          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:05.052371          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:05.322203          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:05.850335          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:05.852349          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:05.852349          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:06.131610          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:06.402310          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:06.412055          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:06.417457          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:06.417457          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:06.421966          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:06.671931          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:06.671931          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:06.671931          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:06.917441          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:07.191992          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:07.716823          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:07.980989          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:07.980989          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:07.983187          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
00:00:09.965508 Watcher  ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={MachineWrap} aText={The virtual machine 'boinc_d5faec8bbe409dd4' has terminated unexpectedly during startup with exit code -1073741819 (0xc0000005)}, preserve=false aResultDetail=0
00:00:09.965508 Watcher  Reaper: Pid 3780 (ec4) exited normally: -1073741819 (0xc0000005)
00:00:10.002179          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={85cd948e-a71f-4289-281e-0ca7ad48cd89} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
00:00:10.042145          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox" with version "1.16-windows"
00:00:10.322205          Saving settings file "C:\Users\43650\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:15.347146 main     VirtualBox: object deletion starts
00:00:15.350153 Watcher  ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={9570b9d5-f1a1-448a-10c5-e12f5285adad} aComponent={VirtualBoxWrap} aText={The object is not ready}, preserve=false aResultDetail=0
00:00:15.350153 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:



2025-07-11 20:16:06 (1540): 
Command: VBoxManage -q list hostinfo 
Exit Code: 0
Output:
Host Information:

Host time: 2025-07-11T18:16:05.939000000Z
Processor online count: 8
Processor count: 8
Processor online core count: 4
Processor core count: 4
Processor supports HW virtualization: yes
Processor supports PAE: yes
Processor supports long mode: yes
Processor supports nested paging: yes
Processor#0 speed: unknown
Processor#0 description: Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz
Processor#1 speed: unknown
Processor#1 description: Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz
Processor#2 speed: unknown
Processor#2 description: Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz
Processor#3 speed: unknown
Processor#3 description: Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz
Processor#4 speed: unknown
Processor#4 description: Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz
Processor#5 speed: unknown
Processor#5 description: Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz
Processor#6 speed: unknown
Processor#6 description: Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz
Processor#7 speed: unknown
Processor#7 description: Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz
Memory size: 8033 MByte
Memory available: 1398 MByte
Operating system: Windows 10
Operating system version: 10.0.22631

2025-07-11 20:16:06 (1540): 
Command: VBoxManage -q showvminfo "boinc_d5faec8bbe409dd4" --machinereadable 
Exit Code: -2135228415
Output:
VBoxManage.exe: error: Could not find a registered machine named 'boinc_d5faec8bbe409dd4'
VBoxManage.exe: error: Details: code VBOX_E_OBJECT_NOT_FOUND (0x80bb0001), component VirtualBoxWrap, interface IVirtualBox, callee IUnknown
VBoxManage.exe: error: Context: "FindMachine(Bstr(VMNameOrUuid).raw(), machine.asOutParam())" at line 2834 of file VBoxManageInfo.cpp

2025-07-11 20:16:06 (1540): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC\slots\3/vm_image.vdi" 
Exit Code: -2135228412
Output:
VBoxManage.exe: error: Could not find file for the medium 'C:\ProgramData\BOINC\slots\3\vm_image.vdi' (VERR_FILE_NOT_FOUND)
VBoxManage.exe: error: Details: code VBOX_E_FILE_ERROR (0x80bb0004), component MediumWrap, interface IMedium, callee IUnknown
VBoxManage.exe: error: Context: "OpenMedium(Bstr(pszFilenameOrUuid).raw(), enmDevType, enmAccessMode, fForceNewUuidOnOpen, pMedium.asOutParam())" at line 179 of file VBoxManageDisk.cpp

2025-07-11 20:16:06 (1540): 
Command: VBoxManage -q createvm --name "boinc_d5faec8bbe409dd4" --basefolder "C:\ProgramData\BOINC\slots\3" --ostype "Linux26_64" --register
Exit Code: 0
Output:
Virtual machine 'boinc_d5faec8bbe409dd4' is created and registered.
UUID: 48ccfac1-c183-4d78-91f6-e13cea58efe0
Settings file: 'C:\ProgramData\BOINC\slots\3\boinc_d5faec8bbe409dd4\boinc_d5faec8bbe409dd4.vbox'

2025-07-11 20:16:07 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --description "UxVNDmrdFs7n9Rq4apOajLDm4fhM0noT9bVof3QYDmBNpKDmzbvN0n_3" 
Exit Code: 0
Output:

2025-07-11 20:16:07 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --memory 4800 
Exit Code: 0
Output:

2025-07-11 20:16:07 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --cpus 8 
Exit Code: 0
Output:

2025-07-11 20:16:08 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2025-07-11 20:16:08 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2025-07-11 20:16:08 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2025-07-11 20:16:08 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --nic1 nat --natdnsproxy1 on --cableconnected1 off 
Exit Code: 0
Output:

2025-07-11 20:16:09 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --cableconnected1 on 
Exit Code: 0
Output:

2025-07-11 20:16:09 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --usb off 
Exit Code: 0
Output:

2025-07-11 20:16:09 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-07-11 20:16:09 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-07-11 20:16:10 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --audio none 
Exit Code: 0
Output:

2025-07-11 20:16:10 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --clipboard disabled 
Exit Code: 0
Output:

2025-07-11 20:16:10 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --draganddrop disabled 
Exit Code: 0
Output:

2025-07-11 20:16:10 (1540): 
Command: VBoxManage -q storagectl "boinc_d5faec8bbe409dd4" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-07-11 20:16:11 (1540): 
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

2025-07-11 20:16:11 (1540): 
Command: VBoxManage -q storageattach "boinc_d5faec8bbe409dd4" --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:

2025-07-11 20:16:11 (1540): 
Command: VBoxManage -q storageattach "boinc_d5faec8bbe409dd4" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2025-07-11 20:16:12 (1540): 
Command: VBoxManage -q storageattach "boinc_d5faec8bbe409dd4" --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:

2025-07-11 20:16:12 (1540): 
Command: VBoxManage -q storageattach "boinc_d5faec8bbe409dd4" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-07-11 20:16:12 (1540): 
Command: VBoxManage -q bandwidthctl "boinc_d5faec8bbe409dd4" add "boinc_d5faec8bbe409dd4_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-07-11 20:16:12 (1540): 
Command: VBoxManage -q modifyvm "boinc_d5faec8bbe409dd4" --natpf1 ",tcp,127.0.0.1,9739,,80" 
Exit Code: 0
Output:

2025-07-11 20:16:13 (1540): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-07-11 20:16:13 (1540): 
Command: VBoxManage -q sharedfolder add "boinc_d5faec8bbe409dd4" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\3/shared"
Exit Code: 0
Output:

2025-07-11 20:16:15 (1540): 
Command: VBoxManage -q startvm "boinc_d5faec8bbe409dd4" --type headless
Exit Code: -1073741819
Output:
Waiting for VM "boinc_d5faec8bbe409dd4" to power on...
VBoxManage.exe: error: The virtual machine 'boinc_d5faec8bbe409dd4' has terminated unexpectedly during startup with exit code -1073741819 (0xc0000005)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine

2025-07-11 20:16:15 (1540): 
Command: VBoxManage -q snapshot "boinc_d5faec8bbe409dd4" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-07-11 20:16:15 (1540): 
Command: VBoxManage -q bandwidthctl "boinc_d5faec8bbe409dd4" remove "boinc_d5faec8bbe409dd4_net" 
Exit Code: 0
Output:

2025-07-11 20:16:15 (1540): 
Command: VBoxManage -q unregistervm "boinc_d5faec8bbe409dd4" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

20:16:21 (1540): called boinc_finish(-1073741819)

</stderr_txt>
]]>

©2025 CERN