Minecraft Forums

https://paste.ubuntu.com/p/g2f4cMvTyx/

Remove:

FoodPlus

musica

remoteio

https://paste.ubuntu.com/p/dvZtTsG4zP/

java.lang.NoClassDefFoundError: net/minecraftforge/fml/relauncher/IFMLLoadingPlugin

You still have mods for 1.8 or newer in Minecraft 1.7.10.

Post a crash report so we can see the entire mod list. Crash reports are found in the crash-reports folder under the .minecraft folder or the folder where the Instance is stored.
Use https://paste.ubuntu.com/

https://paste.ubuntu.com/p/ZxkwhTZkMJ/

In 1.7.10 CodeChickenCore is not able to download CodeChickenLib

Remove CodeChickenCore and its related mods

or

Create a Modpack in 1.8 or higher

or

Manually download CodeChickenLib for 1.7.10

Inside your mods-Folder create new folder and name it 1.7.10

Put CodeChickenLib inside /mods/1.7.10/

https://paste.ubuntu.com/p/NCz2SY2mbt/

Test it without NotEnoughItems

https://paste.ubuntu.com/p/4Js9ZpgDQF/

Remove:

musica

RemoteIO

reliquary

Ars Magica 2
HorseLoading

https://paste.ubuntu.com/p/Tz3SKCZ9Sk/

Remove all mods and these one by one

If you add a mod, make sure you are also adding their dependency mod

Download the mods at curseforge - there always check the "Relation" tab

musica

RemoteIO

HorseLoading

If you don't have these mods removed then add these

HorseLoading the mod not exist

Then one of the other mods requires it

I say the mod horse loading does not exist

Is there a mod like TheMistofRio or similar? If yes, remove it

yes

https://paste.ubuntu.com/p/44wbZKkG3b/

Do you have musica in your modpack?

If not add it:

https://www.curseforge.com/minecraft/mc-mods/musica

Same with RemoteIO:

https://www.curseforge.com/minecraft/mc-mods/remote-io

Also remove CoFHCore

https://paste.ubuntu.com/p/85JpBv4KWS/

These two mods are still not working - remove all mods and add your mods one by one

Or just look for a modpack on curseforge and add some missing mods