how to implement Ode15s with option (odeset) in simulink

using ode15s with option which usese event to terminate the solver in simulink gives error :

An error occurred while running the simulation and the simulation was terminated

Caused by:

• The first input to exist must be a string scalar or character vector.

my code in simulink function is :

options = odeset('Events',[value_ejection,isterminal_ejection,direction_ejection]);

dvdt_ejection = [dve_lvdt ; dve_rvdt ;dve_pudt ; dve_padt; dve_aodt ; dve_vcdt ; dQe_avdt; dQe_pvdt; dQe_mtdt ; dQe_tcdt];

[t_e,v_e,TE_e,VE_e] = ode15s(dvdt_ejection,tspan,v0,options);