Error opening Studio. Message: The input is not a valid Base-64 string as it contains a non base-64 character, more than two padding characters, or an illegal character among the padding characters

Hi, I am trying to open Studio but the following message appears and it closes: 

The input is not a valid Base-64 string as it contains a non base-64 character, more than two padding characters, or an illegal character among the padding characters

I've tried several options I read in this forum but none of them works.

Can anyone please help me?

Thanks!

Mar

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