The database of ITP/MDK Repository Server versions 3.5.9 upto 3.5.17 could contain damaged Field Sets.
When upgrading ITP/MDK Repository Server from these versions, a database check is performed looking for these flaws. If damaged Field Sets are detected in the database, the installation is aborted. Correct the damages first before continuing the installation. Please contact the helpdesk for instructions on how to remedy this situation.