Matlab Xplane UDP transmit Simulink file build fail

Making simulation target "cesna_sfun", ...

"E:\Program Files\MATLAB\R2016a\bin\win64\mex.exe" -c -DMATLAB_MEX_FILE -I"E:\Program Files\MATLAB\R2016a\extern\include" -I"E:\Program Files\MATLAB\R2016a\simulink\include" -I"E:\Program Files\MATLAB\R2016a\simulink\include\sf_runtime" -I"E:\Program Files\MATLAB\R2016a\stateflow\c\mex\include" -I"E:\Program Files\MATLAB\R2016a\rtw\c\src" -I"C:\Users\Alien\Documents\MATLAB\X-Plane Library\X-Plane Library\slprj\_sfprj\cesna\_self\sfun\src" cesna_sfun.c '"E:\Program Files\MATLAB\R2016a\bin\win64\mex.exe"' is not recognized as an internal or external command, operable program or batch file. gmake: * [cesna_sfun.obj] Error 1 Component: Make | Category: Make error Unable to create mex function 'cesna_sfun.mexw64' required for simulation. Component: Simulink | Category: Model error

>> mex -setup MEX configured to use 'MinGW64 Compiler (C)' for C language compilation.

As the error states there is no executable located in the matlabroot or anywhere inside.