Error opening sav on the save editor

[weatherglow]

Opening a common.sav file on the save editor prompts a message that says "Unhandled exception has occured in your application. If you click continue, the application will ignore this error and attempt to continue. If you click quit, the application will close immediately. \n\nCould not load file or assembly 'PackageI0, Version=0.1.7.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies.".