Folder '<folder>' in module '<module>' cannot be retargeted to the global assembly cache because it contains one or more assemblies that are not strong-named
The Module Retargetable Folder property for the referenced merge module is set to the global assembly cache. The merge module contains assemblies that are not strong-named; only strong-named assemblies can be installed in the global assembly cache.
To correct this error
In Solution Explorer, select the merge module.
In the Properties window, select the KeyOutput property. Expand the node and select the Module Retargetable Folder property, and set it to a different folder.