General help

Hey Everyone, 

i use the webservice, my curl looks 

https://MyMoodle/webservice/rest/server.php?wstoken=MyToken&wsfunction=core_course_get_enrolled_courses_by_timeline_classification&moodlewsrestformat=json&classification=inprogress&customfieldname=id&customfieldvalue=7159

The User with the id 7159 is enrolled in diffrent courses, but the Webservice gibes as result: 

{"courses":[],"nextoffset":0}