DaemonUmbra

Ok, so it looks like Lemming published this mod without publishing the version of CoFHCore that supports ensorcellation, and didn't edit the mods.toml of ensorcellation to indicate that this mod has a minimum required version of CoFHCore

Please provide your installer log

Looks like an Optifine bug, they're using a vanilla field that apparently gets patched out by Forge and the JavaDoc on the field explicitly states "DO NOT USE"

The error indicates that though that may be the version you want to use, it's not the one your computer is choosing. If you don't need other versions of Java then uninstall all other versions, if you do need other versions of Java then check your PATH environment variable

Why did you rename the server file? This error means you're trying to run a 1.12.2 server with Java 9 or later, you need to use Java 8

Are you trying to run 1.15.1 Forge with 1.14.4 Optifine installed? This is bound to fail

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner.

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner. Serbian: https://files.minecraftforge.net/maven/net/minecraftforge/forge/index_1.15.1.html

Please provide a screenshot of the server's mods folder

By 1.5 I'm going to assume you mean 1.15, Where are you downloading Forge from? What is the name of the file you're downloading? Do you have Java installed? ("I can run Minecraft" doesn't count because it's not set up in a way for your system to recognize it as a Java installation)

You have 32 Bit Java installed, uninstall it and install 64-Bit Java. Note: For Forge 1.12.2 and older you will need Java 8 specifically, for Forge 1.13 and later you can use Java 8 through 10 https://adoptopenjdk.net

There isn't meant to be a Forge jar in that folder for 1.12.2, why are you looking for one?

The filenames of one or more of your mods suggests you got them from a repost site. Please read up on the StopModReposts project (link in my signature) for info on why this is a bad thing.

How did you install the modpack?

One of your mods was designed for a beta version of Forge 1.14 and is incompatible with the release version, make sure all your mods are up to date

How long have you waited before killing it?

You are missing a mod, follow Diesieben's advice and the proper source will tell you which mod you're missing

The URL in the error

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner.

Try running the jar file manually and tell me what it says. I'm going to predict you have Java 9 or later, while Forge 1.12.2 requires Java 8 specifically.

1.7.10 is no longer supported on this forum due to its age. Please update to a modern version of Minecraft to receive support.

That sounds like something that would be in the server-specific config, which are now stored per-world, check the world folder for a serverconfig folder

Forge 1.13+ requires Java 8-10, you're using 11

Please don't use Drive in the future, it attempts to format things that are intended to be read as plain text and usually ends up making things harder to read. According to this your server took over a minute to process a single tick, causing the watchdog to assume the server crashed and kill it