simulink仿真的时候为什么会出现Error, a block diagram was specified in S-function block 'untitled/S-Function'. Please make sure your S-function name is not a Simulink model or the name of the current model. You can use the Matlab command 'which -all sfunction_name' to locate all occurrences of model files with the name sfunction_name这样的错误,请高手指点一下吧,不胜感激!!!!