Cron[20884]: (CRON) DEATH (can't lock /var/run/crond.pid, otherpid may be 415: Resource temporarily unavailable)

Hi,

I am working with rt-crontool and it says this:

cron[20884]: (CRON) DEATH (can’t lock /var/run/crond.pid, otherpid may be 415: Resource temporarily unavailable).

This probably a script I wrote that crashed my cronjobs.

Can anyone help me where to write the script in RT?

Thanks,
K.