This exception is unrelated to the normal work flow of Test Studio. Steps to reproduce: 1. Create a basic Test Studio Project 2. Clear the Application Log file 3. Re-Open the Project from Welcome screen. The exception is: [...,Telerik.TestStudio.Desktop.exe(12180:3),Error] CodeService.CreateLanguageDataHelper() : EXCEPTION! (see below) Situation: Error loading Assembly cache Outer Exception Type: System.NullReferenceException Message: Object reference not set to an instance of an object. HRESULT: 0x80004003 (Official ID (if app.) = E_POINTER, Error Bit = FAILED, Facility = FACILITY_NULL, Code = 16387) Call Stack: at ArtOfTest.WebAii.Design.CodeGeneration.CodeService.CreateLanguageDataHelper(Object sender, DoWorkEventArgs e)