SamFortney

I am wanting to set up a modded minecraft server for a couple of people. I set up a vanilla server and it worked fine, but when I added mods to the mods folder, it wouldnt load fully. When running the json file to launch the server, it crashes. Heres what it says when it loads up: I have had an issue where the item id is a duplicate from another mod, so I noticed the -34 id number and changed it, and the server booted up. But when I tried to log on from a client computer, I get the error message "Fatally missing blocks or items". Is there any way I can fix this or am I out of luck? Any information would be greatly appreciated. Thank you for your time and have a great day!