Simulink编译时出错提示The specified Real-Time Workshop target cannot be used with a variable-step solver. You must configure the solver options for a fixed-step solver with an appropriate integration algorithm (press Open).<BR>和Error executing build command: Error using ==> make_rtw<BR>Error using ==> make_rtw (ConfigForTLC)<BR>The system target file is configured for RT whereas first is configured for NRT<BR>是怎么回事怎么解决