procedure entry point error accessing mxIsIntVectorWrapper in libmx.dll

Hello, I just upgraded to matlab 2014a form 2012b. I have benn using matlab 2012b to build my RTW library. When I build the library in 2014a and run my simulations, I am getting the error "The procedure entry point mxIsIntVectorWrapper could not be located in dynamic link library libmx.dll". I have searched for this function but couldn't find any mention of it. Any help to fix this error is really appreciated.