Custom Tool does not start

Hello, I am trying to develop a custom tool that utilizes Spotfire.Dxp.Web assembly which provides means of showing forms (i.e. dialogs) to the users on the Web Player. However, as soon as I start my extension locally (to debug it) it complains about the Spotfire .Dxp.Web assembly. I added the reference to that assembly using Visual Studio Add References and the solution builds successfully. I am puzzled why I am getting this error message:


Can somebody give me any tips, please?

(1) Answer