Problem upgrade servicedesk plus from 7022 to 7500

Problem upgrade servicedesk plus from 7022 to 7500

Hello,
 
I'm trying to upgrade servicedesk Plus from 7022 to 7500. But during the installation I recieve the following error "There are no promary or candidate keys in the referenced table..." When I want to view the log. I get a empty screen.
 
Can any help me with this issue?
 
thanks!
 
 

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