Hangfire dll don't load after strong naming

Hangfire dll’s don’t load after strong naming, it gives me error, Error 7 The type ‘Hangfire.JobStorage’ is defined in an assembly that is not referenced. You must add a reference to assembly ‘Hangfire.Core, Version=, Culture=neutral, PublicKeyToken=null’. Can you please suggest how to I resolve this. Because publicKey is null, the dll is not able to load, is there any work around for this?