Sorry about that!  Iíve got a fix for it but itís embedded in a major revision Iím finishing up.  Itís hard for me to paste the fix into the current release without breaking other things since so much has been changed.  I hopefully will have the revision finished and tested sometime next week if that works for you.  Or I can send you a link to my current build, although itís strictly alpha (which is to say Iím still working on it).


On Jun 19, 2014, at 12:51 PM, Katerina Nikolakopoulou <> wrote:


I have run into a problem while trying to use ep toolkit. I have processed and cleaned my EEG data with eeglab and then created the average .ept files for every eeg dataset with ep toolkit. However when I try to read the .ept files I run into this error :

Undefined function or variable "hdr".

Error in ep_readData (line 3161)
Error in ep (line 2581)

 Error while evaluating uicontrol Callback

Its the first time I am using ep toolkit and any help would be great!

Thank you in advance,

Best regards,
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Joseph Dien,
Senior Research Scientist
Maryland Neuroimaging Center
University of Maryland 

Phone: 202-297-8117