This exception is thrown whenever there is a problem with the user's custom toolset definition file. The problem might be semantic or syntactical. If the problem is in the syntax, it can typically be caught by XSD validation.
Assembly: Microsoft.Build.Engine (in Microsoft.Build.Engine.dll)
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.