I'm trying to create a website that uses two projects. One is an ASP.Net\nproject with web forms, the second is a class library. When i add a\nreference to the class library from the asp.net project i get the following\nerror when i try to open a webform in the designer.\n\n"The file failed to load in the Web Form designer. Please correct the\nfollowing error, then load it again: Invalid URL."\n\nWhen I remove the reference to the other project, things return to normal.\nHow can i reference a class library project without the above error?