Problem with deleting a course in Cron; possible related issue of ad hoc tasks not running and auto back-ups

by Robert Malpas.  

Hi,

I'm new to Moodle and have been getting on reasonably well solving issues as they arise. I'm not an expert programmer.

I have four potentially related issues.

The first is that I'm getting an error message in my Cron log as follows:

Adhoc task failed: core_course\task\course_delete_modules,Coding error detected, it must be fixed by a programmer: The course module 79 could not be deleted.

Then in "Server/Tasks/Tasks running now" there is a record:

core_course\task\course_delete_modules which seems to be always running.

Then in Reports/System Status I have an error message relating to the Ad hoc Task Queue which states:

Oldest task is 15 days 22 hours which is more than 4 hours

And finally in my automated course backups report, all course backups are listed as "Queued", and have been like that for about the same length of time as the ad hoc task error.

I'm thinking that all these issues are potentially related. I've looked around for possible solutions but have failed. Do you have any advice on resolving these issues as I'd like to get the ad hoc tasks and automated course backups running again?

Thanks for any advice.