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Cannot validate SDL plug-in: Sdl.TranslationStudio.ProjectManagement.AutoDeleteOnStartup, Sdl.TranslationStudio.ProjectManagement, Version=12.0.0.0, Culture=neutral, PublicKeyToken=c28cdb2

When I tried to open Studio 2015 this morning, I got this message: Cannot validate SDL plug-in: Sdl.TranslationStudio.ProjectManagement.AutoDeleteOnStartup, Sdl.TranslationStudio.ProjectManagement, Version=12.0.0.0, Culture=neutral, PublicKeyToken=c28cdb26c445c888.

I tried the procedure in producthelp.sdl.com/.../5052.html, but was unsuccessful in finding the 3 .xml files on my computer. Could someone please help me? Thank you!