Alright, so I found a weird kinda glitch with either Useful Backpacks or U Team Core. Basically whenever I try and start my game running with forge and with both your mod and UTC the game will crash on initialization, and when I try to run it with just your mod Forge will stop me saying I need UTC, and if I try to run MC without UTC or your mod it crashes on Initialization and same if I run it with just UTC. This has only started with the latest update to 1.14.14. and I have updated both UTC and Useful backpacks to their respective 1.14.14 versions
crash-2019-07-24_17.44.09-client.txt

Hm tested it with theese versions and not crash. Does all versions match?
Do you have other mods installed?

hey I checked and my forge version was 28.0.13 but even after I updated it to 28.0.14 the same crash happened
crash-2019-07-24_18.28.21-client.txt

Can you post the debug log?
The problem is this log does not contain any useful information to investigate the crash :/
Does it work when you remove useful backpacks? When you remove useful backpacks and uteamcore?

I don't know where to find the Debug log, and It only works when I only have useful backpacks and even then it'll only take me as far as the loading screen where it tells me I need to install U Team Core. If I have bothe U Team core and Useful Backpacks installed it will crash and if I have Neither installed it'll crash

(Thats how far I get if I just have Useful BackPacks installed)

So it crashes when you have no usefulbackpacks and no uteamcore installed? Then there is an other issues which your installation.
Maybe try to delete the .minecraft folder and reinstall everything

Closed because not further response. If anything is still now working just hit me up or reopen.