opemmediavault plugin error on "Check"

Code:
Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C.UTF-8; apt-get update 2>&1' with exit code '100': Reading package lists... E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable) E: Unable to lock directory /var/lib/apt/lists/

Error #0:

OMV\ExecException: Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C.UTF-8; apt-get update 2>&1' with exit code '100': Reading package lists...



E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)

E: Unable to lock directory /var/lib/apt/lists/ in /usr/share/openmediavault/engined/rpc/apt.inc:220

Stack trace:

#0 /usr/share/php/openmediavault/rpc/serviceabstract.inc(565): OMVRpcServiceApt->{closure}('/tmp/bgstatus7L...', '/tmp/bgoutputDu...')

#1 /usr/share/openmediavault/engined/rpc/apt.inc(224): OMV\Rpc\ServiceAbstract->execBgProc(Object(Closure))

#2 [internal function]: OMVRpcServiceApt->update(NULL, Array)

#3 /usr/share/php/openmediavault/rpc/serviceabstract.inc(123): call_user_func_array(Array, Array)

#4 /usr/share/php/openmediavault/rpc/rpc.inc(86): OMV\Rpc\ServiceAbstract->callMethod('update', NULL, Array)

#5 /usr/sbin/omv-engined(537): OMV\Rpc\Rpc::call('Apt', 'update', NULL, Array, 1)

#6 {main}