Compiler Error INSANE

Can I kill someone now? I am getting this error: libcpd.lib - unresolved external symbol _errno about 8 of them. Here''s my setup. I have traced it down to this.. I have a Multi-threaded debug LIB creating a class that uses FSTREAM. I include and open a file do whatever and the dll compiles fine, no problems. My client application in C++ is also a Multi-threaded debug win32 application that includes the library that I just created. When I call the function that has the fstream open command, it gives me compiler errors like above. BUT, if I comment out the open command, it compiles fine. The open command is just myFile.open("C:\\file.txt",ios::in); This is mind boggling, the library compiles fine with it, its only the client. There both multi-threaded, I do include on the client, I''ve tried all that. Any clues?? Thanks Jeff