Unable to emit assembly: Referenced assembly '' does not have a strong name

Solution of the assigning the strong name to the third part DLL by using following command on visual studio command prompt.

E.g. Lets say the name of the third party DLL is myTest.dll. 
Step 1: Dis-assemble the assembly 
        ildasm myTest.dll /out:myTest.il

Step 2: Re-Assemble using your strong-name key 
        ilasm myTest.il /res:myTest.res /dll /key:myTest.snk /out:myTestSN.dll

This code work perfectly to assign strong name.

for verification you can use following command,
sn -vf myTestSN.dll

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