_Tarna_

No its ok. Go into the settings tab on the panel and make sure there is a world specified in the box that says "Level Name". If nothing is in there, that may be the issue. If that doesn't work, try pressing repair files in the danger zone tab and start the server if you haven't tried already. 

Also you should've just replied to your original post because that is where you made the question and that is where I also replied so everything stays in one spot if some else ever has a similar issue. But for now here is ok or you can go back to the main post if you want. 

Ok! Sorry for making a post here. I'll tell you what happens on the original post that I made.