DaemonUmbra

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 the mods on both the server and client, right? In the mods folders of both?

Please post the server's debug.log as described in my signature below.

You could post your code as a GitHub repo. You could also include a debug.log if there is one.

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.

The installer code on GitHub does nothing because it is an empty shell. You should not need an installer for mods, their installation should be as simple as dropping a jar file into the mods folder.

For a config file I would suggest Forge's @Config annotation, "for every block" still needs some interpretation though, do you mean every block of that kind will reference the same value or every block of that kind will have that variable but the value may be different from individual block to individual block?

I should mention that it's important that the debug.log come from the same run as the Java Error. You can be sure by clearing your logs folder then running the configuration that crashes again, if the debug.log appears after that then it's come from that same run, if it's not there then your game is crashing before it even starts logging.

Is this a question about how to have the block reference the value or how to build a config file?

If you have a GitHub account post it to a Gist, linked in my signature.

I mean is the Error Log from Java itself the only thing you have or is there a debug.log in any of your log folders? By this I mean a debug.log from the same run the Java Error Log came from.

Do you have any logs besides this? I suspect that while you may have an nVidia card, Minecraft could be ignoring it and using Intel Graphics which seem to be frequently faulty.

You need to use Java 8, you appear to be using Java 9 or later.

Opinion war hidden, please keep on topic.

You appear to have a rogue unknown character immediately following the closing curly-brace for the jei dependencies block, guessing that was accidentally included in a copy-paste.

In the future please provide a full debug.log when you come here with an issue. Though in this case I've seen this particular error enough to know you have Decocraft2, but not PTRLib, a mod it depends on.

Don’t put anything Minecraft related in OneDrive, it does weird things with file permissions.

.minecraft is your client log, the server log will be in the server’s log folder.

Are you running the latest version of every mod?

Don't make clients.

What are you even trying to do if you're not making a mod?

Don't use MCP, use Forge. MCP's core is used by Forge but in its out of the box form it is from a bygone era.

Are you using MCP or Forge?

Are you sure you aren't in the 1.12 section of the downloads rather than 1.12.2? Edit: There is a section 1.12 containing subsections 1.12, 1.12.1, and 1.12.2, make sure you're in the right subsection.

Is this using the buttons in the "Download Recommended" section?