DaemonUmbra

Please read the EAQ or the logs section of my signature and provide the appropriate log.

you need to include the .jar on the end of the Forge file, also I would not recommend keeping the installer there.

The universal is not the installer, use the installer.

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

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

Read the logs section of my signature, you should not be copying from the console, you should be uploading your debug.log to pastebin or Gist and supplying the link it gives you.

Ok, fair warning that version won't be supported much longer. I believe debug.log was called fml-client-latest.log back then.

What version are you in and what client are you using?

Fatally missing blocks and items tends to mean you are missing mods that the server has. To help any further I would need your debug log (more info in my signature)

Please read the EAQ or my signature and provide your debug.log

Logging is derp in 1.13 atm, no debug log

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.

I'm fairly sure the MDK's build.gradle has comments in the dependencies block that describes how to add dependencies to your workspace.

Keep in mind that unless you specifically set a launcher profile to use a separate working directory (where it will put the mods, logs, etc folders), it will use .minecraft which may have remnants from previous modded shenanigans.

At least one of your mods is not providing a valid version, please read the EAQ thread or my signature and provide the appropriate log.

Are you hoping it will show up by itself? That doesn't work with dedicated servers, even local ones. If your client is on the same machine as the server, use "localhost" as the IP to connect to.

Also, is this with the server-ip field empty or still with the IP you put in?

Is this in single player or on a server? How much RAM are you allocating? What modpacks? Some of them are not kind to tickrate.

You are trying to run 1.12.2 with a very old coremod installedd

In my experience you shouldn't touch the IP field in the server unless you know what you're doing or your server host has told you to do so.

It doesn't go to the versions folder anymore

Ok, that's the profile list, you need to create a new launch profile and then Forge will show up in the list of versions for that profile to use.

The MDK also works with 10, however if you use 10 you will not be able to run Forge 1.12.2 and older.

This forum is not for teaching basic programming, sorry. We expect you to put in the effort to learn programming before trying to mod.