please check the config (if u changed it) maybe you did something wrong in your config. If couldn't find the problem then you need to reinstall the plugin. If you didn't change the config, then check it's version is true or do /plugin and get a list of plugins you have installed. Check is there any essentialsX name in you list or not. If its not in your list or its name is red in the list, so there is a problem with the plugin with the server/other plugins that u need download a new one from another site!
