Found a problem in Trackables' page.
It display message:
File does not exist : /var/www/prd/ar/sites/default/files/users/aciang//Track02/Track02.quick_report.xml
steps for this issue (might be):
- Pick created project in 'My Trackables'
- Rename the project
- Rename the trackable
after this.. the problem trackables will stay in the project.. not functioning, you cannot amend or delete it.