Server with mod starts, then immidiatly stops automatically.

I have been playing for a month or so on a Minecraft Forge server. There are 7 mods on it, but the main one is the Create mod. So, I wanted to schematicannon a (quite big) machine that makes gunpowder. I deployed the schematic and put it in the cannon. Then the server closed in one go and I thought it was just a small crash. Nothing came up in the log, so I had no idea what happened. I start the server again, and it starts, but it closes immediately (I can't join in time). Could someone help me figure this out?