I was doing my first upgrade to GP 2015 R2(14.00.0952) from 11.00.2248(GP 2010) and immediately when it starts to upgrade the DYNAMICS database I receive this message "An Unknown error occurred when initializing the conversion". I clicked OK and it continued and when I checked the DUINSTALL.LOG file there is nothing to indicate any issues. Has anyone else experienced this? I will be checking this out more fully once the upgrade is completed.
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