SRM testFailovertest is failing at step 13 error change recovery site storage to writable

• ONTAP Tools for VMware vSphere ( OTV )
• Storage Replication Adapter ( SRA )
• VMware Live Site Recovery ( VLSR ) former VMware Site recovery Manager ( SRM )

• testFailovertest is failing at step 13: change recovery site storage to writable.
• vmware logs can report messages like

error vmware-dr[1234] [SRM@1234 sub=Replication.VmRecoveryInterface ctxID=az09 opID=abc-123-123abc-123abc-123abc-failover:123abc:123abc:123abc] Protection VM 'dr.replication.ProtectedVm:protected-vm-1234' failed operation 'Recover'!  There are '0' warnings for this Protection Group.  Failure Reason: (dr.storageProvider.fault.StorageFailoverFailed) {
-->    faultCause = (vmodl.fault.SystemError) {
-->       faultCause = (vmodl.MethodFault) null,
-->       faultMessage = <unset>,
-->       reason = "N2Dr3Xml20XmlValidateExceptionE value '' does not match regular expression facet '[+\-]?[0-9]+' (1)"
-->       msg = ""
-->    },
-->    faultMessage = <unset>
-->    msg = ""
--> }
--> [context]a..Z0..9-=[/context]