Is it possible to add a file with the constraints in the directory where you write all the HTML files ? It's important, when you do a lot of tries, to remember under which constraints that timetable has been created.
After a successful generation, the results directory contains a locked filename_data_and_timetable.fet file. Open that file and unlock all activities in time and space -> it will result the initial file (only if your initial file contains locking time and space constraints which are not permanently locked, these will be removed by unlocking).