Blanchard Kahn conditions are not satisfied: no stable equil

[settler03]

Dear All
when run a dynare code, i received following error:

??? Error using ==> print_info at 40
Blanchard Kahn conditions are not satisfied: no stable equilibrium

Error in ==> stoch_simul at 81
print_info(info, options_.noprint);

Error in ==> n8 at 381
info = stoch_simul(var_list_);

Error in ==> dynare at 120
evalin('base',fname) ;

please help if anybody knows my model problem or guess
Whit Best

[ptr]

Try model_diagnostics(M_,options_,oo_) to see the cause of the problem