Agile Sync job fails with the following error: API-1019: Could not process the request due to internal error.

Document ID : KB000008974
Last Modified Date : 14/02/2018
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Issue:

Synchronization Agile Central job is failing with the following error for several tasks and projects:
java.lang.ClassCastException
com.niku.nmc.agile.AgileIOException: 500
api.internalError
API-1019 : Could not process the request due to internal error.

Cause:

Projects that are associated with more than 20 milestones may run into this issue on 15.2. The reasoning for this is that there is a hard limit of how many milestones may be associated with a project/task in Agile Central; which is 20.

Resolution:

This issue is resolved in 15.3 and would require an upgrade. There is currently no workaround for this issue in 15.1, 15.2.