ok, fixed it by adding the capability for location...
BUT, now that i used my cert for creating the sis-file, are other people with other IMEIs able to sign and use the program?
i've built a little tool which uses the locationrequestor module.
when i start the py-script from the python shell, the programm is working 100% correct.
but when i'm using the sis file i've made using ensymble, there's no gps-connection established. neither internal nor external gps works.
is there anything i have to take care of when creating the sis-file?