WSPBuilder obfuscation dll

I am using WSPBuilder to create a wsp file for sharepoint. One of my referenced dlls got confused with .Net Reactor. When creating a wsp project, this DLL is not recognized, WSPbuilder throws an error. I am not with the solution to manually install this dll as it has to be part of a complete sharepoint farm setup with multiple web ends.

Any solution or idea for a workaround?

The error I am getting is this: Cannot resolve assembly 'WSPBuilder.XmlSerializers, Version = 0.9.8.206, Culture = neutral, PublicKeyToken = 2b778c59697d7d9e' please use DLLReferencePath to point to the directory this DLL is in.

Thank.