edit: minehut is having issues with every server. give it like 30 minutes or check their discord for updates when it's fixed. if not then you can follow what i said below.
it's almost always user error. whatever you did to make this happen, revert that change. for example you may have edited something in your bukkit.yml file and messed up the spacing or whatever and now it won't start. if you don't remember what you did to cause this issue, try to start up your server and check your latest logs. your logs will show you any errors your server is having. if you don't know how to find them then it's likely you don't know how to understand them so just send them in the comments of your thread using pastebin or something. to find them go to your dashboard, click the server you're having issues with, go to file manager, logs, latest logs.