Load New Data > Type Data Loader returns "For soft type <type name>, its parent can not be null!" during upgrade of Windchill PDMLink

Migrator EXECUTING: Type data loader for 10.0.:367397276-1255103213722-22130853-137-8-253-132 (0.0%) - Type data loader for 10.0. started
Message: Error in method server code:
java.lang.Exception: Exception of type 'java.lang.reflect.InvocationTargetException' was generated on the server with message 'null'

INFO  [UpgradeEventFirer] com.ptc.windchill.upgrade.logging.UpgradeFrameworkLogger - Migrator EXECUTING: Loads updated ESI Release Activity Type:595369174-1627372922369-639105046-1-0-0-127 (0.0%) - Loads updated ESI Release Activity Type 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'

For soft type "<type name>", its parent can not be null!

INFO  [RMI TCP Connection] wt.system.out xxx - Processing data file: Windchill\loadFiles\esi/ESIReleaseActivityTypeDefinition.xml
 INFO  [RMI TCP Connection] wt.system.out xxx- Getting container path= '/'
INFO  [RMI TCP Connection] wt.system.out xxx- Using container with path= '/'
ERROR [RMI TCP Connection] com.ptc.core.lwc.server.TypeDefinitionLoader xxx- Performing type definition load, while type initialization is still in progress.
INFO  [RMI TCP Connection] wt.system.out xxx- Load failed: (endProcessTypeDefinition): For soft type "com.ptc.windchill.esi.txn.ReleaseActivity", its parent can not be null! -- Loader-context[type: com.ptc.windchill.esi.txn.ReleaseActivity] at com.ptc.core.lwc.server.TypeDefinitionLoader.endProcessTypeDefinition(TypeDefinitionLoader.java:1094)
 INFO  [RMI TCP Connection] wt.system.out xxx - Loader method com.ptc.core.lwc.server.TypeDefinitionLoader.endProcessTypeDefinition reported a failure