Error message #6000 while trying to apply changes after creating a new LVM and EXT4 filesystem on it

Everything is in the title of this message.
I get this error message:
Error #6000:exception 'OMVException' with message 'File contains invalid JSON (filename=/var/lib/openmediavault/fstab_tasks.json): ' in /usr/share/php/openmediavault/util.inc:277Stack trace:#0 /usr/share/php/openmediavault/module.inc(141): OMVJsonFile->read()#1 /usr/share/openmediavault/engined/module/fstab.inc(52): OMVModuleAbstract->execTasks('delete')#2 /usr/share/openmediavault/engined/rpc/config.inc(164): OMVModuleFsTab->stopService()#3 [internal function]: OMVRpcServiceConfig->applyChanges(Array, Array)#4 /usr/share/php/openmediavault/rpcservice.inc(125): call_user_func_array(Array, Array)#5 /usr/share/php/openmediavault/rpc.inc(79): OMVRpcServiceAbstract->callMethod('applyChanges', Array, Array)#6 /usr/share/openmediavault/engined/rpc/filesystemmgmt.inc(900): OMVRpc::exec('Config', 'applyChanges', Array, Array)#7 [internal function]: OMVRpcServiceFileSystemMgmt->mount(Array, Array)#8 /usr/share/php/openmediavault/rpcservice.inc(125): call_user_func_array(Array, Array)#9 /usr/share/php/openmediavault/rpc.inc(79): OMVRpcServiceAbstract->callMethod('mount', Array, Array)#10 /usr/sbin/omv-engined(500): OMVRpc::exec('FileSystemMgmt', 'mount', Array, Array, 1)

Many thanks, it worked great and solved the thing!
Cheers,