problem in loading model on Arduino mega

I am loading my simulink model to Arduino mega but i am getting below error, so please help me

 The call to realtime_make_rtw_hook, during the after_make hook generated the following error:
    The build failed with the following message: pwmtry.mk:233: *** missing `endif'.  Stop.

The build process will terminate as a result.

The build failed with the following message: pwmtry.mk:233: * missing `endif'. Stop. Component: Simulink | Category: Model error