cron: can't lock /var/run/crond.pid, otherpid may be 3759

I had a cron job setup that I cleared using cron -r last night.

This morning I tried to enable it again and get this error each time:

cron: can't lock /var/run/crond.pid, otherpid may be 3759: Resource temporarily unavailable

I have tried rebooting and it didn't help. OS = Debian.


Solution 1:

I was making a dumb error. I should be using crontab command instead of cron.