I apologize vehemently for the delay in getting back to you. I didn't find issue with running the specified test (runall.aii) if I built the solution first. I wasn't able to build the provided solution until I modified the following two lines in Retro_Validate_Requests.aii.cs:
The modification done was to comment these two lines out. After commenting them out in the specified code-behind file the build completed successfully and the test ran without creating the error (albeit it was not able to execute the full test).
The reason for this is that the software will still compile the code-behind files in the same folder, but will only call the one currently in use. This error is hitting during compile time for the execution process, so the above and possibly some other items are causing issue.
Open the project and try to build it. When you do, the error list will point each error out in the error list. Locate each of these and either comment out the steps or add in the necessary information to allow the code-behind step to compile.
the Telerik team