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The defined Project Assembly seems not to be a valid assembly
When I build my solution using WSPBuilder I get a message which stated that the defined project assembly seems not to be a valid assembly.
Created by Carsten Keutmann
GPL License 2007
The solution id from the solutionid.txt is used. The SolutionID from the Manifest.Config file is ignored!
Building the solution - please wait
The defined Project Assembly seems not to be a valid assembly!
Solution compatibility: SharePoint 2010
Saving the Manifest.xml file
Creating the WSP file
What does that mean?
I've had a look at other discussions on here and have checked that the target framework is .NET Framework 3.5, as others have suggested.