Hi Yannick
Thank you for the expressive reply, I have put some time to study the materials you mentioned.
I have realised my first unsupervised classifier and it worked out successfully, yet I am still stuck with the supervised classifier:
I would kindly invite you to have a look on my post where I have explained the error:
https://forum.orfeo-toolbox.org/t/itk-error-shapefile-field-not-find/116
I would be grateful for any help.
Best regards
Panteha