I also have a similiar issue. did you manage to find a solution . Upgrading from 11.2 to 12.1
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)
at wt.method.MethodResult.writeExternal(MethodResult.java:226)
at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1447)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1421)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1169)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:345)
at sun.rmi.server.UnicastRef.marshalValue(UnicastRef.java:293)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:369)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:562)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:796)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:677)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:676)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.lang.Thread.run(Thread.java:829)
2024-09-02T20:04:49,253 FATAL [main] com.ptc.windchill.upgrade.updates.UpdateRunner - com.ptc.windchill.upgrade.updates.UpdateExecutionException: Error executing IncrementalUpdate Membershiplink entries deletion for License Group (#156660745-1580882389801-788625466-1-0-0-127)
Nested exception is: (com.ptc.windchill.upgrade.updates.directives.directivesResource/39) com.ptc.windchill.upgrade.updates.DirectiveExecutionException: Method server code wt.org.UpdateMembershiplinkForLicenseGroups.deleteMembershipLink failed. See nested exception for details
Nested exception is: wt.util.WTException: java.lang.reflect.InvocationTargetException
Nested exception is: java.lang.reflect.InvocationTargetException