Try the following steps
1.) Stop following services:
- LUA PostgreSQL
- LUA Apache Tomcat
2.) Then restart them
3.) Log in to the LUA
4.) Go to "Download and Distribute"
5.) Selected the "Download Schedule" which was cancelled by you.
6.) Delete selected Schedule
7.) Recreate Schedule
8.) Start new download Schedule
The old download task will stay in 'Recent Download and Distribute Activity window" on main page, but will be not active anymore.