App Layering 4.1 - Failed to Create Layer, 'A specified parameter was not correct. url'

When attempting to create a layer, the error below is displayed: ​Failed to execute the script: vCenter returned an unexpected failure = Fault Code: 'ServerFaultCode' FaultMessage: 'A specified parameter was not correct. url' Details: "attributes":"xsi:type":"InvalidArgument","invalidProperty":"u...