I've find the solution in the blackberry forum ! thanks and sorry
In addition, you can try this sequence:
1) Remove AppWorld from your BB (Homescreen > Options > Advanced Options > Applications) -- if it requests that you reboot the BB, do so.
2) Do a proper Batt-Pull reboot (power ON, remove battery, wait, insert battery, boot)
3) Get a new link and install a fresh copy of AppWorld
*
http://na.blackberry.com/eng/ser ... sp#tab_tab_download
* Again, if it requests to reboot, do so.
4) Do another Batt-Pull reboot