Hi Luc Ham, Thank you for using PeMSyn and sorry for the late reply. I think this error is related to Curve Fitting Toolbox that was required for PeMSyn 2.3.2. Now (today) we've just released PeMSyn 2.3.3 that does not require Curve Fitting Toolbox in Matlab. Please, keep me updated about the current issue if it was not solved yet. Feel free to send me and email (geyverson@ieee.org). Once again, sorry for the late reply (I thought the Sourceforge would notify me about the new messages, but it didn't...