Error occurred while enabling — plugin crashes on startup

A plugin loaded but crashed while starting — usually because it targets a different server or plugin version than the one installed. It then disables itself: your server keeps running normally, but this plugin's functionality is entirely gone, with no further error.

The error line names the plugin and its version — check the mods/plugins UI for a build matching your server version and update it. If the line right below shows a NoSuchMethodError or NoClassDefFoundError mentioning another plugin, both need to be brought to matching versions.