if else is not working correctly inside parfor loop

If I run the following piece of code using for loop, it woks fine. But when I am using the same with parfor I get an error.

Code snippet:

vhFlag = 3;
nCores = 8;
matlabpool(nCores)

parfor id = 1 : obj.patchNum

      if(3 == vhFlag)
            % fetch each patch from the list for matrix creation
            patch = testMat(:,:,id);
      else                    
            % randomely choose a patch id
            patchCounter = ceil(rand(1) * 100);

            % get the corresponding patch (original or resynthesized)
            patch = StimuliGeneration.GetAPatch(patchListBest, ...
                                                patchCounter, sz-1, 
                                                vhFlag);
            testMat(:,:,id) = patch; %%to test                   
      end
      mat(:, id)      = patch(:);

end

matlabpool close

Error : Starting matlabpool using the 'local' configuration ... connected to 8 labs.

??? Undefined function or variable "patchListBest".

Error in => StimuliGeneration>StimuliGeneration.CreatePatchMatrix at 48

            parfor id = 1: obj.patchNum

[Edric Ellis]

Is 'patchListBest' a function or a variable?