Compiler Error CS1509
Referenced file 'file' is not an assembly; use AddModules option instead
An output file (output file 1), produced in a compilation that used the module element of the TargetType (does not have an assembly manifest), was specified to References. So, rather than appending an assembly to the assembly for the current program, the metadata information in output file 1 will be added to the assembly for the current program.
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