This is a forge bug, you cant not use old worlds, you must use a new world.
See MinecraftForge/MinecraftForge#8915

This is a forge bug, you cant not use old worlds, you must use a new world. See MinecraftForge/MinecraftForge#8915

you mean create a new world from zero?
there isn't any way to save my world?

Correct.

Correct.

c'mon the is a way to solve it

Correct.

actualy i tought to put the immersive portal mod to solve it.
only a problem... IT IS TOO OLD and a 1.18.2 version don't exist

If you have NBTExplorer, a way to try and fix the issue is to make a new world, open its level.dat file, go to the WorldGenSettings, copy the nether and end, and paste them into your broken world’s level.dat file

where can i download nbt explorer

If you have NBTExplorer, a way to try and fix the issue is to make a new world, open its level.dat file, go to the WorldGenSettings, copy the nether and end, and paste them into your broken world’s level.dat file
how can i copy that dimension thing?

ok, i have it

If you have NBTExplorer, a way to try and fix the issue is to make a new world, open its level.dat file, go to the WorldGenSettings, copy the nether and end, and paste them into your broken world’s level.dat file

If you have NBTExplorer, a way to try and fix the issue is to make a new world, open its level.dat file, go to the WorldGenSettings, copy the nether and end, and paste them into your broken world’s level.dat file

You can click on them, ctrl+C to copy, and then ctrl+v to paste in the other world‘s level.dat opened in another NBTExplorer window

You can click on them, ctrl+C to copy, and then ctrl+v to paste in the other world‘s level.dat opened in another NBTExplorer window

how can i add the end and the nether files?

You can click on them, ctrl+C to copy, and then ctrl+v to paste in the other world‘s level.dat opened in another NBTExplorer window

actualy i discovered that the end and the nether files don't exist!!!

Thats what I am describing. Take the nether and end entries from the fresh world’s level.dat file and put them into the level.dat file that is missing them.

Thats what I am describing. Take the nether and end entries from the fresh world’s level.dat file and put them into the level.dat file that is missing them.

ok i did it now i will check iif it work

Thats what I am describing. Take the nether and end entries from the fresh world’s level.dat file and put them into the level.dat file that is missing them.

it worked, thanks man.