Upgrade Manager Fails on "Load BAC Groups and BAC Policy Access Control Rules" in Windchill PDMLink 12.0

• UpgradeManager Fails on Load BAC Groups and BAC Policy Access Control Rules
• No logs in Method Server
• UpgradeManagerLog4j log reports error

INFO ?[UpgradeEventFirer] com.ptc.windchill.upgrade.logging.UpgradeFrameworkLogger - Migrator EXECUTING: Load BAC Groups and BAC Policy Access Control Rules:184205761-1600421548694-1423983012-1-0-0-127 (0.0%) - Load BAC Groups and BAC Policy Access Control Rules started
ERROR [UpgradeEventFirer] com.ptc.windchill.upgrade.logging.UpgradeFrameworkLogger - Message: Error in method server code:
java.lang.Exception: Exception of type 'java.lang.reflect.InvocationTargetException' was generated on the server with message 'null'
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:566)
	at com.ptc.windchill.upgrade.updates.directives.MigratorMethod.invoke(MigratorMethod.java:131)
	at com.ptc.windchill.upgrade.updates.directives.LightWeightServiceDirective$Server.invokeLightWeightServiceApi(LightWeightServiceDirective.java:635)
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:566)
	at wt.method.MethodResultWriter.writeExternal(MethodResultWriter.java:165)