DaemonUmbra

Are you on Linux?

I'm not sure actually.

bspkrs made a Mapping Viewer a while ago. I’ve mostly been using ForgeBot, an instance of tterrag’s Discord bot K9, which lives in the Forge Discord Server and can be DMed to keep channels clear of spam.

Please post your code as a GitHub repository, make sure the git root is the folder with the .gitignore file provided by the forge MDK

Look into Forge's Access Transformers, I don't think we have an official docs page on them at this time, but this is the tutorial I followed.

That is also 1.7.10, which is no longer supported because it is ANCIENT. Please update to receive support.

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.

You have a client-only mod on the server.

You're only giving 256M to minecraft. The Mojang launcher is set to give 1G by default, what launcher are you using?

That one makes more sense, Thaumcraft needs an update

There shouldn't be any issues other than potential lost convenience (you will likely need to manually specify the path of the Java exe of the old version in order to use it, rather than simply typing java).

As Lex had stated in the thread (I forget the exact words, this is my approximation), modders tend to not update their stuff until they are FORCED to(in this case, by users moving to the new recommended version, which their stuff doesn't work on). The breaking change that was seen most was changes in the Coremod system, which already walks the thin line of being allowed but not supported and is some of the most change-sensitive stuff. This change(build 2763, posted 09/27/18 09:37 PM) came about a week before the release build(build 2768, posted 10/04/18 07:48 AM) went up. I'm going to lock this here because anything further will just be an argument of how things should be run.

Those aren't the right logs for diagnosing server problems, open a command prompt (Windows Key + R, then type cmd and press enter). Run the command java -version and paste its output here.

Can you post the log with only Thaum and Baubles?

At least one of the coremods is stupidly broken, if you can find out which you can try to toss it out

Does this happen without coremods? This should not be happening unless a coremod is mucking around in the Item class.

I'm afraid I don't know if Forge can run on a server that has so little memory and I doubt a webserver will have enough processing power anyway.

Try Thaumcraft with only its dependency(Baubles), does it still crash?

This is not what a webhost server is for...

Please pastebin or Gist your debug.log

512M? That's not enough for modded... try giving it 2G or 3G

This should be self-explanatory.

What command are you using to start the server? Does it have flags that set the JVM's memory allocation?

I think I see the issue, for some reason the latest release is for the 1.7.10 version of the mod. You need the latest release that's tagged for 1.12.2.