Can you interpret this, please, or tell me where to find an answer? I know the problem is not at line 9.
Log Details (ERROR)
Logger: homeassistant.config
Source: config.py:415
First occurred: 12:37:24 AM (16 occurrences)
Last logged: 8:01:57 PM
Invalid config for [automation]: Expected HH:MM, HH:MM:SS or Entity ID with domain ‘input_datetime’ or ‘sensor’ @ data[‘at’][0]. Got None. (See /config/configuration.yaml, line 9).
Hi! We won’t be able to help you if you don’t share your automation code. Also, when you post code, please select it, and hit this button: 
Thanks!
Somewhere in your automations you have a time trigger with an incorrect value in your ‘at’ key.
Thanks. That’s a good start.
Thanks. Fixed. I had some stray stuff from playing around to learn new things. I had to delete and rewrite some automations and entities.
Thanks. I’ll learn to format and add code.