DaemonUmbra

One of your mods is broken and trying to access client-only code from common code. I can't tell which mod from the information you've provided.

What exact version were you trying to install?

You can post within an hour, it just has to be more substantial(meaning actually provide information) than just "bump".

Where did you download Forge from?

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

From the looks a Botania Mana Pool used to be there and didn't get cleaned up properly by the code It looks like a TileEntity got left behind and it thinks an air block is still a Mana pool, so it crashes trying to treat it like one.

9Minecraft is the biggest of these problem sites...

Please take a look at my forum signature and make sure your friends get this information as well. Your file names suggest many of these mods have come from sketchy sources.

Where are you getting your mods?

Gradle import is under "Show other specialized import wizards" (I'm an intellij user so I need to keep looking back at Eclipse).

Check your mods folder for a folder called 1.12.2, it looks like a mod you installed previously and then removed put one of its components in there that needs to be cleaned up manually.

That looks like a 32-Bit JDK to me

Have you tried importing the build.gradle?

I believe you can import it from the build.gradle and let Eclipse's Gradle integration handle it.

Where is your JDK installed?

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.

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

If you installed the JRE and JDK separately you may have a 64Bit JRE with a 32Bit JDK.

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.

To do this properly you'll need to use a Java IDE.

Try removing RPGLoot

How did you build your mod?

Please keep this forum in English. What JDK version are you using?

What do you mean by "import stuff from the internet"? Do you mean use code from libraries, other mods, Forge, or Minecraft itself?

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.