Hello all,
Since the last update 4.1.30-1 I have the error message 'Invalid RPC response' .. and since I cannot view my hard drives in "Files Systems" and "Logical Volumes".
I have all my standalone drives and my volume groups formated as btrfs., the last update seems to correct something about this format, but for me that kill my system...
Please find below an extract from my syslog.txt
Code
Dec 29 09:05:32 openmediavault omv-engined[8638]: PHP Fatal error: Uncaught TypeError: Argument 2 passed to array_keys_exists() must be of the type array, null given, called in /usr/share/php/openmediavault/system/filesystem/backend/manager.inc on line 284 and defined in /usr/share/php/openmediavault/functions.inc:140#012Stack trace:#012#0 /usr/share/php/openmediavault/system/filesystem/backend/manager.inc(284): array_keys_exists(Array, NULL)#012#1 /usr/share/php/openmediavault/system/filesystem/filesystem.inc(816): OMV\System\Filesystem\Backend\Manager->enumerate()#012#2 /usr/share/openmediavault/engined/rpc/filesystemmgmt.inc(69): OMV\System\Filesystem\Filesystem::getFilesystems()#012#3 [internal function]: OMVRpcServiceFileSystemMgmt->enumerateFilesystems(NULL, Array)#012#4 /usr/share/php/openmediavault/rpc/serviceabstract.inc(123): call_user_func_array(Array, Array)#012#5 /usr/share/openmediavault/engined/rpc/filesystemmgmt.inc(320): OMV\Rpc\ServiceAbstract->callMethod('enumerateFilesy...', NULL, Array)#012#6 [internal function]: OMVRpcServiceFileSystemMgmt->getList(Array, Array)#012#7 /usr/share/ in /usr/share/php/openmediavault/functions.inc on line 140
I never have any issue since that update 
, if someone can help or a fix can be done 
Regards.
