Hi mojave27,
"I built the identical solution successfully in recent days, but today it gives me this error:"
Could you please clarify that you build the identical solution with the same compiler or not? If you use the same compiler, could you please tell us that which compiler you use?
According to your description, I think your project is set to target the VS2008 toolset. If you open a VC++ project create in VS2008 with VS2010, the conversion process automatically sets the Platform Toolset property to v90, if VS2008 is also
installed on the same machine. Attempting to build the project on a machine that only has VS2010 installed, returns the above error. The Platform Toolset property must be set to v100 in order for a project to compile on a machine that only has VS2010 installed.
More information, please refer to :
http://support.esri.com/en/knowledgebase/techarticles/detail/38068
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