I am trying to generate s-function of a subsytem which contains set of user defined as well simulink blocks using RTW.i have a issue with this message ,### Model failed to compile with strict bus check on ### Turning strict bus check off?Any idea?

error message: ### Model failed to compile with strict bus check on ### Turning strict bus check off

there is no issue if i am trying to generate code using user defined function blocks only,but i am facing this problem if the subsytem contains both user defined and standard simulink blocks like constant,MUX etc