sir i m optimizing pid parametrs using genetic algorithm and error there r some errors...pls help

Undefined function 'initializega' for input arguments of type 'double'.

Error in Initial_PID_GA (line 22) initPop=initializega(populationSize,variableBounds,evalFN,evalOps,options);

>> PID_objfun_mse(x_pop, options) Undefined function or variable 'x_pop'.