Hi @brjYoussef ,
Welcome to Microsoft Q&A!
First, if you don't have the latest SP installed, you can try to install the latest (SP)SP4:
https://www.microsoft.com/en-us/download/details.aspx?id=56040
Secondly, you can refer to this blog to troubleshoot step by step.
https://bennyaustin.com/2011/07/26/ssas-troubleshooting-this-exception-%E2%80%93-%E2%80%9Can-unexpected-error-occurred-file-mdinfo-cpp-line-nnnn-function-mdinfoinit%E2%80%9D/
Best regards,
Seeya
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