Ugdhar

You should always show what you tried. Best way to share code is to host your project on github as a buildable project, so others can look at it (and see the whole picture), as well as build/debug it if desired. Also make sure there's nothing in the debug.log that's giving you more information.

Put a space between Java and -jar

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This thread is over 2 years old. Please create a new thread, and post full, not partial, logs.

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It should expand and fill in the whole filename for you. So I typed java -jar for<TAB> and it autofilled to java -jar .\forge-1.15.2-31.1.0-installer.jar

Please give step by step details on how you set up your modding workspace/IDE.

Take a look at vanilla code, maybe wither skeletons as they always have a sword (I think?). Zombies also can wield swords, so looking at the code for them might help you too.

Post the full debug log please

The document named debug is likely debug.log, windows is silly how it hides file extensions by default. But that's the one diesieben07 was looking for.

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1.12 is no longer supported on these forums due to age. Please update to a modern version to receive support here. More information on supported versions can be found in the LTS link at the top of every page.

This thread is almost 5 years old, please make your own thread, and post logs and details of your issue. Also please read the LTS link at the top of every page for information on the currently supported versions.

The good news is you have Java 8, so once you get there the installer should run. I do notice you have the 32-bit version, hopefully it won't matter for running the installer. I am guessing that you may not be in the correct directory (folder) when executing the command. Ctrl+M in the command window will let you mark stuff to copy (press Enter after marking it), and then you can paste what your command prompt window looks like here. Show your attempt at running the installer, and then after also show the results of typing dir at the command prompt.

Are you holding down shift on the keyboard when you right-click? Also, make sure you're not right-clicking on a file.

Try using Java 8

Ah ok, so you typed out the error you got, not a copy/paste. You should try running it from the commandline. If you're on windows, open the folder the installer is in, hold shift and right-click an empty space to get a menu, and choose open powershell (or command) here. Then type java -jar forge<TAB> (actually press tab, not <TAB>)

I would guess that you spelled the filename wrong. use tab completion, get to the word forge then hit tab.

Is this running the mod all by itself so there's only the 1 extra itemgroup, or do you still have 5+? It didn't make a new tab at the bottom for you?

I don't watch video tutorials, sorry. I was looking for step by step explanation of what you did, not a video. How do we know you followed all the steps in the video? Are your path names and *everything* the same? Anyhow, you should be using both eclipse and genEclipseRuns tasks to get setup, either from the commandline, or running the tasks within eclipse. And I'm not sure how to fix your funky character in your path. Maybe just make a folder C:\Modding so you can just avoid it altogether? A good rule of thumb, any type of identifier/name, don't use spaces or special characters.

Please give details on how you set up your workspace

I believe this may be caused by the DISTANCE property in LeavesBlock. It looks at though it only checks for a tree trunk that far from the leaves, so once you get past 7 (default value) they start to decay. Ran into this when messing with learning how to make trees, but never bothered to fix it once I discovered what was going on.

what is "MOSS_STONE"?

If you are running windows, open the folder the installer is in, right-click on a blank spot and choose open command (or powershell) window. then in that window, type java -jar <filename> and press enter. So if the file I downloaded was forge-1.15.2-31.1.37-installer.jar it would be java -jar forge-1.15.2-31.1.37-installer.jar If it fails, type java -version and paste the output here.