Dear Jochen, The incompatibilities I mentioned are between the tutorial and the nestml version you pointed me to: https://github.com/nest/nestml/blob/v5.2.0/models/neurons/izhikevich.nestml but all of them will disappear when the docker version and the latest nestml version are the same. I mean, when no "end" commands are needed anymore in nestml... In any case, it was renaming v -> V_m and u -> U_m, nothing really important! ;-) cheers gus.-