Amesim和Simulink联合仿真

AMESim和Simulink联合仿真报错，有大佬知道是啥问题吗？Error in 'sscfluids_engine_cooling_system/ECM/S-Function' while executing C MEX S-function 'ECM_', (mdlDerivatives), at time 0.0.
In Simcenter Amesim mexfunction: ECM_, Simcenter Amesim fatal error
Unexpected call to mdlDerivatives, Simcenter Amesim model has no continuous state !