<div class="gmail_quote"><div class="im"> >I don't have an explanation for the installation thing, but that error is caused by your exec line which is incorrect. sugar-activity expects the "path" to a class as > first argument, not the name of a script. </div>Okay. I've changed the <a href="http://activity.info" target="_blank">activity.info</a> following your advice. Now the patched version display the home page of the activity. But when I click on the "play" button, there is another error in the log file: <div class="im"> Traceback (most recent call last): </div> File "/home/olpc/Activities/Tuxmath.activity/activity.py", line 192, in _button_play_clicked_cb self.create_script(os.getenv("TUXMATH_SCRIPT")) File "/home/olpc/Activities/Tuxmath.activity/activity.py", line 185, in create_script f = open(script_path, 'w') TypeError: coercing to Unicode: need string or buffer, NoneType found Not sure to understand what it means but I was interested by the "TUXMATH_SCRIPT" environment variable. I've studied the difference between the unpatched version and the patched version related to this script call. When I start the unpatched version it create a "/home/olpc/.sugar/default/org.ceibaljam.Tuxmath/tux_homedir/tuxmath_scrip t.sh". This script seems to call the binary file to execute tuxmath. But when I launched your patched version, the script was not created. It's why the "play" button do nothing. I told that at first launch the activity seems to build "something". This "something" is probably this script. BTW I don't know why it is not created when the activity is patched before. Any idea ? Lionel. </div>