Dear Oulaourf,
Using the same parameters as you do and Matlab 2015a, I don’t get any error. In this case I can not help you much. I suggest to check the file +utils/miscUtils.m, line 338 parameter ecdf_data.mean_f = interp1(unique_x,unique_y,mean_data);; check if inputs unique_x and unique_y are vectors, from your error it seems they are not vectors but scalars and then you have troubles in Matlab’s function interp1().
Best regards,
Fjolla