Error "Object reference not set to an instance of an object" in Studio 2019, quick help needed

Hello,

I get the dreaded error message "Object reference not set to an instance of an object".most of the time when opening Trados Studio 2019. I have tried most of the suggested fixes for this problem, but nothing works (have tried reinstalling and repairing Studio, renaming relevant folders etc.). Sometimes I am able to open Studio and also most of my imported packages, but there is one offline cloud package which always prompts the aforementioned error message. 

Any suggestions are welcome.

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