POWER BI ISSUE

I was receivng an error message for AUTH token needs to be refershed after the ADMIN on the account left my company, through some help here i was able to do a takeover and change this to my name, i was hopeful that would fix it but now i have a new error message . Now i have run into a new issue, it now shows this error. Any idea on how to fix? please keep in mind i have very limited knowledge base of this lol, the person who set this up is no longer with my company and i'm just trying to continue utilizing is at we were. no changes have been made to any files or anything, except for that person being removed, and i did the takeover. My error message changed from Autho token needs to be refreshed, to the below: 

Expression.Error: the key didn't match any rows in the table. The exception was raised by the IDBCOMMAND interface.