Error in SVM at line 470

Hi all

i am getting the fallowing error for svmtrain

??? Error using ==> svmtrain at 470
Unable to solve the optimization problem:
Maximum number of iterations exceeded; increase options.MaxIter.
To continue solving the problem with the current solution as the
starting point, set x0 = x before calling quadprog.

I use SVM like this svmstruct=svmtrain(PosNegF,group); while the dimension PosNegF are 666 x 10 and group are 666 x 1

Please help me.