Cadiboo

What are you trying to do, from an end-user perspective? Minecraft#getInstance is setup very, very early and shouldn’t be null in that event.

Are you able to see the Minecraft source code in your IDE or are you just going off that website?

This error is likely caused by one of these mods. It isn’t possible to tell which one from that error alone.

BetterFoliage is broken.

Sorry we don't support 1.7.10 (it's 4+ years old!) or any version under 1.10 on this forum anymore due to their age. We simply don't know how to help you anymore. You can go to the Minecraft Forum where I think that they still still support older versions, or update to a modern version of Minecraft (the latest version or the one before it) to receive support on this forum.

Post your debug log

Any .jar file is a "java executable program". Delete everything from/Library/Java/JavaVirtualMachines/ and then download and install Java 8 from https://www.java.com/en/download/mac_download.jsp

That isn't the full log. Please post your debug log as described in my signature and the EAQ

You're launching a vanilla server. How are you launching the server?

That error means that you need to select a run config because you haven't selected one before.

How are you launching the server?

Make sure you have the latest NEI

Just a note: 1.14.2 is out, you might want to skip 1.13.2

If you want to do that, you can use Reflection. You'll need to find something to put into your blocks constructor when the mod isn't installed though

If you're running gradlew.bat setupDecompWorkspace it should work.

Sorry we don't support 1.7.10 (it's 4+ years old!) or any version under 1.10 on this forum anymore due to their age. We simply don't know how to help you anymore. You can go to the Minecraft Forum where I think that they still still support older versions, or update to a modern version of Minecraft (the latest version or the one before it) to receive support on this forum.

What version? The "most recent version of Minecraft" is 1.14.2 and that command was removed between 1.12.2 and 1.13.

Don't use runClient, use the run/launch config from your IDE

A soft dependency uses Reflection to do its stuff. A hard dependency directly references the other mod's code. Right now you've got a hard dependency.

Sorry we don't support 1.8.9 or any version under 1.10 on this forum anymore due to their age. We simply don't know how to help you anymore. You can go to the Minecraft Forum where I think that they still still support older versions, or update to a modern version of Minecraft (the latest version or the one before it) to receive support on this forum.

Forge below 1.13.2 requires Java 8. You have Java 12.0.1

I specifically did not tell you to go use IntelliJ. I'm not sure whats wrong, it works perfectly for me. I would recommend refreshing the gradle project and if that doesn't work, making a GitHub repo.

Depends what you’re using them for.

What version. Override getCapability (and hasCapability if you’re on an outdated version) and return your energy storage

In 1.13.2 item models are registered for you, it’s dead simple. Just have a model json in your assets/<modid>/models/item/ folder