DaemonUmbra

Please post the debug.log from both server and client, preferably using Pastebin or GitHub Gists. Both are linked in my signature.

JRed I have to ask, how did you learn Java?

PTRLib is a required dependency of Decocraft.

Please upload your debug.log from both server and client.

What's your GPU?

Yes I was looking at the wrong files (my goodness I'm off my game today) ... looking at the screenshot again I don't see the mod that was the source of the issue (filename from CF is Ida) so I'll assume it's the one that was hiding in your 1.12.2 folder. Funnily enough it has no use except as an addon for Device Mod so if it was being accidentally included there is no harm in removing it.

I'm guessing when I told you to get device mod you got it from 9Minecraft, because looking at the filesize from your screenshot it does not match the size of the one I got from CurseForge. I was comparing the wrong files

Check both of those folders

That is not a log of forge alone, that has at least one mod in it and it is the mod complaining about being unable to find Crayfish's device mod

If it crashes with forge alone send a log of Forge alone

NEVER get anything from 9Minecraft. I urge you to check out the StopModReposts project and install their browser extension.

What's crashing you is LWJGL being unable to find a library...

Where are you getting your mods?

As suspected, you installed Furniture Mod rather than Device mod. I'm blind

Can I get a screenshot of your mods folder?

Post a new log

You are missing MrCrayfish's Device mod, the crash has nothing to do with "Couldn't get hash..."

How are you running the server? Are you just double clicking on jar files? If so, which one?

If the mods folder does not exist when the server or client is run Forge creates it.

1.7.10 is no longer supported on this forum. Please update to receive support.

https://mcforge.readthedocs.io/en/latest/ is the official documentation though it is laughably incomplete at this time. I recommend you look at the events section then use your IDE to see what events Forge offers.

What launcher are you using?

Forge has a version checker that allows your mod to notify users of available updates, I would recommend you use that. Granted it is not an auto-updater but it is much simpler for modders to implement and in my honest opinion easier for users to trust than a mod that downloads files without user approval.

No, it’s a log to which the server/client writes entries of what it is doing and in some cases what it is doing that thing to. It’s important when the program encounters an error that it may or may not be able to skip or recover from when it makes a note of that error in the log. Information on where the log is and how we would prefer you posted it can be found in my signature (the text block below this message).

I have an idea of what might be going on, please read my signature and post the appropriate log as described.