Ugdhar

Post the new log from this crash.

Make sure you are using 64 bit java. "java -version" (without the quotes) from the commandline will say 64-bit if it is; i.e:

Remove the old mods from your mods folder.

Try removing the config folder in your game directory. Make a backup first just in case.

Keep in mind that 1.12 is no longer supported on these forums, so if you run into issues you will be on your own, or have to seek help elsewhere. The LTS link at the top of every page has more information on supported versions.

Essentially support on these forums will only be given for the last 2 versions (1.14/1.15 currently) of Minecraft, everything else is unsupported, and the moderators will close threads opened for them. It doesn't mean you can't use them or seek support on other websites, just not here. There are just too many versions to make it feasible to support old versions on here, plus most of the developers on here use current stuff, not old stuff. The LTS link at the top of the page has more information.

1.12 is no longer supported due to age. Please update to a modern version if you wish to receive support here. See the LTS link at the top of every page for more information on supported versions. On a side note, make sure you do NOT download mods from places like 9 minecraft, I would suggest only using curseforge.com, otherwise mods may be outdated and/or packed with malware/viruses. See https://stopmodreposts.org/ for more information on which sites to avoid. If you have downloaded from these sites, I would delete the downloads.

1.12 is no longer supported due to age. Please update to a modern version if you wish to receive support here. See the LTS link at the top of every page for more information on supported versions.

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

Please keep this forum in english I would guess it is one or both of these mods, try making sure they are the latest version, or try removing them to see if the crashing stops. If it does, then that's the problem, and I would report it to the mod author(s).

1.12 is no longer supported due to age. Please update to a modern version to receive support. See the LTS link at the top of every page for more information on supported versions.

If you read the posts above, these questions are answered. The AxeItem name change is explained, and there is a link to a migration guide, it says 1.13, but it is largely applicable to all the newer versions. If you have issues working on your mod, make sure your code is posted as a working github repository (easiest way to get people to help debug), start a new thread, and post any logs from crashes in their entirety, or explain what you are trying to do, and what is not working.

Can you get a world object to check if your world isRemote? I would imagine that the render thread doesn't run on the server and/or is not the one you're looking for.

I would try to make it work for 1.15.1 or .2, and also make sure your code is a working github repository. This will make it so if someone wants, they can clone your repository and build it themselves to help debug it if they have the time and/or inclination. Then link to it here with errors you get that you cannot figure out, and post logs if it runs but crashes. I did find the link that describes many of the changes that came after 1.12, so it may help. https://gist.github.com/williewillus/353c872bcf1a6ace9921189f6100d09a

Your issue is probably different, make a new thread and post logs as described in the EAQ

Please use English on these forums. 1.7 isno longer supported due to age. Please update to a modern version to receive support. Information on supported versions can be found in the LTS link at the top of every page.

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

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

I hate bumping topics, but I'm genuinely curious about this. No input from anyone huh?

Make sure it's the latest Java 8, and not the latest version of Java (Which I believe is Java 13)

Old versions are no longer supported, see the LTS link at the top of every page for more information.

Does it work if you use vanilla? Please post logs as described in the EAQ (pinned post in support forums index)

1.12.2 is no longer supported on these forums due to age. Please update to a modern version to receive support. See the LTS link at the top of every page for more information.

1.11.2 is no longer supported on these forums due to age. Please update to a modern version to receive support. See the LTS link at the top of every page for more information.

Can you post the output of ./gradlew eclipse Hopefully it will contain some information of use in solving your issue!