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If the converting process freezes during the processing you can play around with the maximum allocated memory for the java process. With the parameter "-Xmx6g" you can allow to allocate 6 GB at maximum of RAM to the java process. This is normally enough for average sized databases. If you have bigger sizes of databases you can grow this value up to the available physical RAM in your computer.
issues:
mainly occurs after reinstalling the custo diag server.
The problem is that the server does not yet have all components active.
What helps here is to start the diag server service again and wait approx. 5-10 minutes, then stop the service again and then execute the command again.