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I migrated my web hosting servers from cPanel to Directadmin earlier this year. The transition was smooth for the most part, but one problem was that users with blank crontabs with cPanel had corrupted crontabs post-migration. They could ssh in, and issue crontab -e, but any attempts to manipulate the crontab via Directadmin’s web interface resulted in the following error:

Error Parsing Cron File

The fix for this problem is to clear out all the lines in /usr/local/directadmin/data/users/username/crontab.conf.