Why resuming the paused VMs are failing with error "argument must be a string or a number" in the vdsm logs

Issue

• After restarting the vdsmd service, the VMs went into paused status.
• Resuming the paused VMs are failing with below error in the engine logs.

2017-04-24 11:56:27,240 INFO  [org.ovirt.engine.core.vdsbroker.ResumeVDSCommand] (org.ovirt.thread.pool-6-thread-13) [31903304] START, ResumeVDSCommand( ResumeVDSCommandParameters:{runAsync='true', hostId='8459faa5-0810-44e7-af98-6b9a32ac3ae8', vmId='f660174d-422d-4e68-8c56-4b6789ce629d'}), log id: 294c66fa
2017-04-24 11:56:28,245 WARN  [org.ovirt.engine.core.vdsbroker.vdsbroker.ResumeBrokerVDSCommand] (org.ovirt.thread.pool-6-thread-13) [31903304] Unexpected return value: StatusForXmlRpc [code=-32603, message=VM u'f660174d-422d-4e68-8c56-4b6789ce629d' was not started yet or was shut down]

• The VMs are actually running fine and can be accessed using ssh. However it's unmanaged from the RHV-M , since it's paused.