Culture not supported issue

I am getting the message culture is not suported, but only for two DLLs. The issue is that we had to Change due to dev shortcuts from Simplified Chinese to just simply Chinese. While most of the DLLs work fine 2 DLLs give me the error message that the culture is not supported? Any Ideas? I already uninstalled and re-installed Passolo as well as the .NET Framework. I am using Passolo 2015 15.1.297