the variable can't be classified with parfor

I have large code and need fix the error of variable(perror) as can't be classified and I can summarized my code.

ind=1; indx =1; limit=4; % Opening the output file

fid=fopen('Parallel_k_n_L_test_16_6_2014.txt','wt');

parfor SNR=0:5

   undetected_errors = 0; 
    SNR
   frmerror=0;
   bitnerr=0;
   frames=0;
   .
   .
   .
   .
             % Decoder ---------------
      [success,kr,dd0,x_hat1]=turbo_decoder_infectious_no_int_z_9_6_2010(rcv,si,H1,co,fid,frames); 
     % ---------------------------------------------
      dseq1=dd0;
       % B E R ------------------
       error=sum(abs(dseq1-b));
     perror1=error/size(b,2);
     perror(frames)=perror1;  %(the problem here)
     if error~=0
        frmerror=frmerror+1
        bitnerr=bitnerr+error;
        if success == 1
            undetected_errors = undetected_errors +1;
            c_w(indx,:) = co;
            noise_w(indx,:) = noise;
            b_w(indx,:) = b;
            kr_w(indx,:) = kr;
            x_hat1_w(indx,:) = x_hat1;
            indx = indx +1;
           end
        end
     merror=mean(perror);
     ferror(ind)=merror;
     frmerr(ind)=frmerror;
     ind=ind+1;
     bits=frames*size(G1,1);
     BER=bitnerr/bits
     FER=frmerror/frames
    end
   fclose('all');
   semilogy(SNR,BER);

the result un error as the variable perror can't be classified

so plz can anyone help me fix the problem me make other other variables and shall need matlabpool for high speed? also my program working well for.

[Ahmed]

???