Wakealarms RPC Error

omv-rpc -u admin "Wakealarm" "setJob" '{"uuid":"70905bed-daed-41b6-92fe-79100a0d8b9a","enable":true,"minute":"58","everynminute":false,"hour":"19","everynhour":false,"dayofmonth":"18","everyndayofmonth":false,"month":"4","dayofweek":"*","comment":"Die Simpsons b955268045f7da4c9578dc9bad5cddfa"}'

{"response":null,"error":{"code":0,"message":"Failed to execute XPath query '\/\/system\/wakealarm\/jobs\/job[uuid='70905bed-daed-41b6-92fe-79100a0d8b9a']'.","trace":"exception 'OMV\\Config\\DatabaseException' with message 'Failed to execute XPath query '\/\/system\/wakealarm\/jobs\/job[uuid='70905bed-daed-41b6-92fe-79100a0d8b9a']'.' in \/usr\/share\/php\/openmediavault\/config\/database.inc:78\nStack trace:\n#0 \/usr\/share\/php\/openmediavault\/config\/database.inc(96): OMV\\Config\\Database->get('conf.system.wak...', '70905bed-daed-4...')\n#1 \/usr\/share\/php\/openmediavault\/config\/database.inc(237): OMV\\Config\\Database->getAssoc('conf.system.wak...', '70905bed-daed-4...')\n#2 \/usr\/share\/openmediavault\/engined\/rpc\/wakealarm.inc(74): OMV\\Config\\Database->set(Object(OMV\\Config\\ConfigObject))\n#3 [internal function]: OMVRpcServiceWakealarm->setJob(Array, Array)\n#4 \/usr\/share\/php\/openmediavault\/rpc\/serviceabstract.inc(124): call_user_func_array(Array, Array)\n#5 \/usr\/share\/php\/openmediavault\/rpc\/rpc.inc(86): OMV\\Rpc\\ServiceAbstract->callMethod('setJob', Array, Array)\n#6 \/usr\/sbin\/omv-engined(536): OMV\\Rpc\\Rpc::call('Wakealarm', 'setJob', Array, Array, 1)\n#7 {main}"}}