What would this be from in the error log?

[94civicEX]

I have little knowledge, so if this is simple then feel free to give me flak, haha.

I found this and it appears often in our error log:

[Thu Mar 16 01:00:21 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_warns.php on line 31
[Thu Mar 16 01:00:07 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_alerts.php on line 33
[Thu Mar 16 01:00:05 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_bans.php on line 30
[Thu Mar 16 00:59:06 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_warns.php on line 31
[Thu Mar 16 00:59:05 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_alerts.php on line 33
[Thu Mar 16 00:59:03 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_bans.php on line 30
[Thu Mar 16 00:58:19 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_warns.php on line 31
[Thu Mar 16 00:58:18 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_alerts.php on line 33
[Thu Mar 16 00:58:07 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_bans.php on line 30
[Thu Mar 16 00:57:13 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_warns.php on line 31
[Thu Mar 16 00:57:12 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_alerts.php on line 3
[Thu Mar 16 00:57:03 2006] [error] PHP Fatal error: Call to a member function on a non-object in /home/hondaacu/public_html/forums/includes/cron/kill_bans.php on line 30

We are currently using Inferno Warning System v1.3.

I looked in these files and the error'd files say vB3 Warn System V1 By Zero Tolerance.

Why would vB be calling to these files?

[Paul M]

Because you have them setup as scheduled tasks.

[94civicEX]

Because you have them setup as scheduled tasks.
So I'd be safe in deleting those 3 from the Scheduled Tasks?

[94civicEX]

Paul?