Failed to decode content (filename=/var/lib/openmediavault/dirtymodules.json):

Fel #6000:
exception 'OMVException' with message 'Failed to decode content (filename=/var/lib/openmediavault/dirtymodules.json): ' in /usr/share/php/openmediavault/util.inc:284
Stack trace:
#0 /usr/share/php/openmediavault/module.inc(365): OMVJsonFile->read()
#1 /usr/share/php/openmediavault/module.inc(55): OMVModuleMgr->setModuleDirty('monit')
#2 /usr/share/php/openmediavault/module.inc(45): OMVModuleAbstract->setDirtyByName('monit')
#3 [internal function]: OMVModuleAbstract->setDirty(8, 'org.openmediava...', Array)
#4 /usr/share/php/openmediavault/notify.inc(124): call_user_func_array(Array, Array)
#5 /usr/share/openmediavault/engined/rpc/webgui.inc(118): OMVNotifyDispatcher->notify(8, 'org.openmediava...', Array)
#6 [internal function]: OMVRpcServiceWebGui->setSettings(Array, Array)
#7 /usr/share/php/openmediavault/rpcservice.inc(125): call_user_func_array(Array, Array)
#8 /usr/share/php/openmediavault/rpc.inc(79): OMVRpcServiceAbstract->callMethod('setSettings', Array, Array)
#9 /usr/sbin/omv-engined(500): OMVRpc::exec('WebGui', 'setSettings', Array, Array, 1)
#10 {main}