linkage Issue with polyspace while running Code Prover

While running code prover in polyspace 2019, we are getting an error for every model "Error: linkage specification is incompatible with previous extern void.

/* runnables */

#ifdef __cplusplus

extern "C" {

#endif /* __cplusplus */

extern void Run_SSM_StrtStopMngr(void);

#ifdef __cplusplus

} /* extern "C" */

#endif /* __cplusplus */

/* API functions */

#ifdef __cplusplus

extern "C" {

#endif /* __cplusplus */