Source imaging from intracranial EEG

I tried to calculate an OpenMEEG headmodel using non-interhemispheric ECoG electrodes and experienced the attached error. I selected the OpenMEEG cortex surface method. I am using a windows 7 computer and Matlab 2012b. As you can see on the figure not all electrode contacts are on top of the cortical segmentation. Does this cause the problem?

Thanks for your support!

Marcel