Error message when I tried to open a new document to translate

I got the following error message. What does this mean?

"Could not load file or assemb;y ‘Sdl.ApiClientSdk.StudioSubscription, Version=1.1.6.0, Culture=neutral, PublicKeyToken=c28cdb26c445c888’ or one of its dependencies. The system cannot find the file specified"

Thanks

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