I havr a server with 4gb ram and i was playing it last night before suddenly the server crrashed. For a few moments the panel was not working and now when i load the server many world does not load certain plugins and more . I tried to contact but no answer... Log :https://pastebin.com/MTKDsdKj
There are so many error! Try this... take a backup of your folder /plugin... Delete the folder /plugin in your server folder and copy only .jar plugins!
Two plugins have no proper plugin.yml. One has problems with some configfile. Another plugin has a config value that is invalid. ' Blabla don't Blabla' This don't work replace it with 'Blabla do not Blabla'