You get this error when building your application in Iron Speed Designer with the Visual Basic .NET compiler:
Unable to compile application...
Check to see if your solution file (SLN) contains a VBPROJ file that includes multiple AssemblyInfo.vb files. If a VBPROJ does include multiple AssemblyInfo.vb files, you must exclude (or move, delete, etc.) all but one of them from the project to avoid the compilation error.
Part VII: Troubleshooting Applications
Application Generation and Compilation Error Messages