I recently started a server on 1.12.1 (just for me and my friends) and used Minecraft Forge (the correct version) to start this. However, I downloaded FTB Util and FTB Lib from Curse and after I had downloaded them an error message comes up in the run-minecraft when I start the server and someone tries to connect: "[23:29:15] [Netty Server IO #2/INFO] [FML]: Disconnecting Player: This server requires FML/Forge to be installed. Contact your server admin for more details." Due to this, no-one can join my server, which is a major annoyance. I deleted the two mods and it still pops up with this error message along with saying that the mods aren't there which may cause problems. Despite what the error message says, earlier in the launch sequence it says: "[23:28:00] [Server thread/INFO] [FML]: Forge Mod Loader has successfully loaded 7 mods". This confuses me as it proves I have FML installed and it says when a player tries to connect that I don't. Is there any way to fix this, or if I want to keep my world will I have to make a fresh install, creating a new server and copying the world folder over? Sorry if this is very complicated or difficult to understand. Thank you so much for your help