@dubai_skyscraper said: The initialization in line 930 + 931 looks like this: def_screw_thread = def_list.add ("Screw thread") ent_screw_thread = def_screw_thread.entities I really thought that looked like a space, between the .add and the ("Screw thread"),... It could be a "vacuum" character though. P.S.are brackets, { } are braces, ( ) are parenthesis.