MDW01

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Post logs.

Make sure you are running the same mods he is using.

Remove natura.

This isn't an issue with Forge make sure you are using the default Minecraft launcher.

I think the latest version should still be compatible.

Post your logs.

Download the installer and the server jar for the version you want to use make sure all of these are the same version.

There's this great tool called google. Post here or make a git issue on their GitHub. https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/1272389-worldedit-do-really-big-things-in-game-in-game-map

This is the forge forums, not the world edit forums. It says report this so go report it to the author. Also, post the logs as it said in the chat.

Use Java 8.

No, the error means that it could not download the vanilla server which it needs to run the forge server. You need to download the Minecraft server jar from Mojang for the version of Minecraft you want to use. Place it in the folder with the forge jar and rename it to 'minecraft_server.1.xx.x.jar' replace the 'x' with your version number. Then continue to launch the forge jar.

Usually to fix this you to do download the Minecraft server jar manually for your version and put it in the folder. You may have to rename it to 'minecraft_server.1.12.2.jar' or whatever your version is so Forge is happy.

It is not really that much harder and if you are struggling with the new system we can help you with it. That's what we are here for.

Contact the mod author.

Yes just have your interface check if the armor is equipped.

The basics are: Create an IExtendedReach interface that will allow you to identify when you can use extended reach, and provide a method to get the value of the reach. Make your custom command/effect implement the IExtendedReach interface. Create and register a custom IMessage packet for telling the server about a successful attack. Handle the MouseEvent where you: Check whether the mouse left button was clicked. Check whether an IExtendedReach item is equipped. Calculate a MovingObjectPosition with the reach of the item. If the MovingObjectPosition returns an entity, send a custom packet to the server to call the attack method on that entity. Heres a similar tuturial http://jabelarminecraft.blogspot.com/p/minecraft-modding-extending-reach-of.html

Are you clicking a block if not what are you?

Weather 2 mod is broken remove it.

Are you left clicking an item?

First off this is the off topic subform for support with making mods check out Mod Developer Central > Modder Support. Also if you just plan on doing basic effects such as speed and health you can use the existing ones as an example of how to make your own modified version. If you are trying to do something more complex give an example and I will try to help you figure out how to do it.

Post the log file not an image of it.

Do what it's telling you to do download the Minecraft server jar for your version and put it in the folder. You may have to rename it to 'minecraft_server.1.12.2.jar' so forge is happy. If you updated java to the latest version it will also cause issues make sure you are using Java 8.

Once again I apologize I miss read what you had said. If I understand correctly it works when you run it in your workspace but not when you export the jar. This would be because in your workspace your code has access to the jar but when you export it the Minecraft client can not find the library. To fix this you do what is called shading in dependencies. This copies the library into the jar when you export it so your code can still have access to the library once it has been exported. I recommend you use this Gradle plugin to help you shade in your library. https://github.com/johnrengelman/shadow If you need any help figuring out how to use this let me know.

Sorry I could have worded that better. So maven can be used as a build script but it is mainly used as a repository for libraries. The example I gave you is for gradle and it will fetch the library from the maven repository and use it to compile your project. You just have to specify a version.