Let's Encrypt SSL Will not setup for new domains

Hi friends! I recently changed the Apache mode on my Centos 7.3 VPS to use MPM_WORKER. I went from 4 restarts per day with MPM_PREFORK to an absolutely stable system with MPM_WORKER. My problem now is that when I create new domains with a Let’s Encrypt Certificate, it fails and gives me the following message:

Changing IP address of virtual website …
… done

Adding new SSL virtual website …
… certificate file is not valid : Line 31 does not look like PEM format

Saving server details …
… done

Applying web server configuration …
… done

Nothing gets changed, or installed. And there is nothing in the Apache system log indicating the problem. Please help me get to the bottom of this problem. Thanks!!

Hi everyone! Ok, I was able to fix this. It was as simple as deleting the old SSL files in hte home directory of the domain. SSL now setups up like a champ!!!