^Title. quests.yml is still in the plugin folder with all the quests inside. Typing /questadmin reload shows that 0 quests have been loaded, and /quests list returns that no such page exists.

There is likely an error in your quests.yml. If this is still an issue, try moving the file and letting the plugin generate a new one. Then compare the file structure. You could also try an online YAML parser (use google).