Proxmox. ERROR: Backup of VM 109 failed – CT is locked (backup)

Proxmox. ERROR: Backup of VM 109 failed – CT is locked (backup)
  • I try to create backup of the container (LXC) in my Proxmox and I get the error:
INFO: starting new backup job: vzdump 109 --node myserver --mode snapshot --storage backups-stor --remove 0 --compress lzo
INFO: Starting Backup of VM 109 (lxc)
INFO: status = running
ERROR: Backup of VM 109 failed - CT is locked (backup)
INFO: Backup job finished with errors
TASK ERROR: job errors
  • I get error message:
Configuration file 'nodes/myserver/qemu-server/109.conf' does not exist

Bug fix

KVM:

qm unlock <VM ID>
qm unlock 109

LXC

pct unlock <ID>

in my case:

pct unlock 109
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Fatal error: Uncaught Error: Class 'W3TC\Util_Http' not found in /www/wwwroot/hostslb.com/wp-content/plugins/w3-total-cache/Cdn_Plugin.php:1030 Stack trace: #0 /www/wwwroot/hostslb.com/wp-content/plugins/w3-total-cache/Cdn_Plugin.php(862): W3TC\_Cdn_Plugin_ContentFilter->fill_regexps() #1 /www/wwwroot/hostslb.com/wp-content/plugins/w3-total-cache/Cdn_Plugin.php(313): W3TC\_Cdn_Plugin_ContentFilter->replace_all_links('<!DOCTYPE HTML>...') #2 [internal function]: W3TC\Cdn_Plugin->ob_callback('<!DOCTYPE HTML>...') #3 /www/wwwroot/hostslb.com/wp-content/plugins/w3-total-cache/Util_Bus.php(21): call_user_func(Array, '<!DOCTYPE HTML>...') #4 /www/wwwroot/hostslb.com/wp-content/plugins/w3-total-cache/Generic_Plugin.php(549): W3TC\Util_Bus::do_ob_callbacks(Array, '<!DOCTYPE HTML>...') #5 [internal function]: W3TC\Generic_Plugin->ob_callback('<!DOCTYPE HTML>...', 9) #6 /www/wwwroot/hostslb.com/wp-includes/functions.php(4609): ob_end_flush() #7 /www/wwwroot/hostslb.com/wp-includes/class-wp-hook.php(287): wp_ob_end_flush_all('') #8 in /www/wwwroot/hostslb.com/wp-content/plugins/w3-total-cache/Cdn_Plugin.php on line 1030