RHEV: Cannot import VMs and encountering the error "Operation Canceled: can do action general failure"

Issue

• Seeing these errors in rhevm.log too:

2012-02-27 16:38:52,120 ERROR [org.ovirt.engine.core.vdsbroker.irsbroker.IrsBrokerCommand] (http-0.0.0.0-8443-2) ERROR, GetImageDomainsListVDSCommand(storagePoolId = 06e6690a-5c47-11e1-b5d6-525400112bfc, ignoreFailoverLimit = false, compatabilityVersion = null, imageGroupId = 4bad92f6-88d9-4222-a07c-2977c07d4ad4), exception: NullPointerException: , log id: 37fc1162
java.lang.NullPointerException
        at org.ovirt.engine.core.vdsbroker.irsbroker.StorageDomainGuidListReturnForXmlRpc.<init>(StorageDomainGuidListReturnForXmlRpc.java:19)
        at org.ovirt.engine.core.vdsbroker.irsbroker.IrsServerWrapper.getImageDomainsList(IrsServerWrapper.java:238)
        at org.ovirt.engine.core.vdsbroker.irsbroker.GetImageDomainsListVDSCommand.ExecuteIrsBrokerCommand(GetImageDomainsListVDSCommand.java:17)
        at org.ovirt.engine.core.vdsbroker.irsbroker.IrsBrokerCommand.ExecuteVDSCommand(IrsBrokerCommand.java:1553)
        at org.ovirt.engine.core.vdsbroker.VDSCommandBase.ExecuteCommand(VDSCommandBase.java:60)
        at org.ovirt.engine.core.dal.VdcCommandBase.Execute(VdcCommandBase.java:41)