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Compiler Error CS1509 

Error Message

Referenced file 'file' is not an assembly; use '/addmodule' option instead

An output file (output file 1), produced in a compilation that used /target:module (does not have an assembly manifest), was specified to /reference. 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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