Some migrators fail to run with "The series or seed is undefined: IntegerHarvard" error in Windchill PDMLink

• Error in Upgrade Manager log:

Caused by: wt.util.WTRuntimeException: Unable to construct version identifier for series: wt.series.HarvardSeries.XXXXX; nested exception is:
java.lang.reflect.InvocationTargetException
at wt.vc.VersionControlHelper.getVersionIdentifierSeriesFromSeriesName(VersionControlHelper.java:1564)
at wt.vc.VersionControlHelper.getVersionIdentifierSeries(VersionControlHelper.java:1530)
at wt.vc.VersionControlHelper.getVersionIdentifierSeries(VersionControlHelper.java:1549)
at wt.vc.VersionControlHelper.getVersionIdentifier(VersionControlHelper.java:327)
at wt.vc.VersionValidator.checkVersionsValid(VersionValidator.java:122)
at wt.vc.StandardVersionControlService$6.notifyVetoableMultiObjectEvent(StandardVersionControlService.java:601)
at wt.events.StandardKeyedEventBranch.intDispatchEvent(StandardKeyedEventBranch.java:306)
... 41 more
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at wt.series.MultilevelSeries.newMultiLevelSeriesFromSeriesName(MultilevelSeries.java:566)
at wt.vc.VersionControlHelper.getVersionIdentifierSeriesFromSeriesName(VersionControlHelper.java:1558)
... 47 more
Caused by: wt.util.WTRuntimeException: The series or seed is undefined: XXXXX; nested exception is:
(wt.series.seriesResource/8) wt.series.SeriesException: The series or seed is undefined: XXXXX
at wt.series.HarvardSeries.<init>(HarvardSeries.java:731)
at wt.series.HarvardSeries.newHarvardSeries(HarvardSeries.java:946)
... 53 more
Caused by: (wt.series.seriesResource/8) wt.series.SeriesException: The series or seed is undefined: XXXXX
at wt.series.HarvardSeries.lookInMap(HarvardSeries.java:900)
at wt.series.HarvardSeries.toRight(HarvardSeries.java:480)
at wt.series.HarvardSeries.<init>(HarvardSeries.java:728)
... 54 more

• Upgrade Manager fails at Phase "Execute Server Migrators" in Task "Disable ECAD templates 475629649-1505204046388-1486371051-207-32-128-10" 
• Upgrade Manger logs reports error 

INFO  [UpgradeEventFirer] com.ptc.windchill.upgrade.logging.UpgradeFrameworkLogger - Migrator EXECUTING: Disable ECAD templates.:475629649-1505204046388-1486371051-207-32-128-10 (0.0%) - Disable ECAD templates. 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)
    at wt.method.MethodResult.writeExternal(MethodResult.java:226)
    at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1447)