Installation error - Trados 2021

I have Trados Studio 2021 installed on my computer (Windows 365) and have had no problems until I tried installing a plugin & now I am unable to start Trados. The error I get is:

"Sdl.TranslationStudio.AlignmentEditor.IAlignmentEditorService' could not be started.

An item with the same key has already been added."

I have tried uninstalling Trados & reloading it, but the same error message is displayed. Any suggestions?

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