A plugin config file has broken YAML
Applies to Paper, Vanilla.
What it looks like in your log
org.bukkit.configuration.InvalidConfigurationException: while scanning a simple key
What causes it
A hand-edited YAML file has a syntax error: a tab character, wrong indentation, or an unquoted colon.
How to fix it
Open the file named in the error and fix the line it points at. Use spaces only, and quote any value containing a colon or ampersand.
Not sure this is your problem? Paste your log and Roastd will tell you which of these it actually matched, and what else it found.
Check your own log