this world contains invalid save data

[The_Hyperdeity]

so i switched my world from vanilla to forge then back to vanilla (aternos) and now that error message appeared when i tried to log in, here's the full latest log:

 

https://mclo.gs/nLfQiHa

[Ugdhar]

1 hour ago, The_Hyperdeity said:

so i switched my world from vanilla to forge then back to vanilla

Which would mean we should have a vanilla log, but that's a forge log you posted?

[The_Hyperdeity]

35 minutes ago, Ugdhar said:

Which would mean we should have a vanilla log, but that's a forge log you posted?

Quote

yes, my bad, that log was just because i tried to switch back to forge to try and fix the problem, here's the vanilla log: https://mclo.gs/UN4I72R

 

[Ugdhar]

The problem is the save is expecting the mods it was run with, probably due to there being items/blocks/etc in the world from those mods.

Try adding --safeMode to your commandline that runs the server, and see if that works.

[16:45:01] [ServerMain/WARN]: Missing data pack mod:mr_dungeons_andtaverns
[16:45:01] [ServerMain/WARN]: Missing data pack mod:torchbowmod
[16:45:01] [ServerMain/WARN]: Missing data pack mod:the_afterdark
[16:45:01] [ServerMain/WARN]: Missing data pack mod:explorerscompass
[16:45:01] [ServerMain/WARN]: Missing data pack mod:darkloot
[16:45:01] [ServerMain/WARN]: Missing data pack mod:walljump
[16:45:01] [ServerMain/WARN]: Missing data pack mod:terralith
[16:45:01] [ServerMain/WARN]: Missing data pack mod:commonnetworking
[16:45:01] [ServerMain/WARN]: Missing data pack mod:configlibtxf
[16:45:01] [ServerMain/WARN]: Missing data pack mod:forge
[16:45:01] [ServerMain/WARN]: Missing data pack mod:journeymap_api
[16:45:01] [ServerMain/WARN]: Missing data pack mod:geophilic
[16:45:01] [ServerMain/WARN]: Missing data pack mod:collective
[16:45:01] [ServerMain/WARN]: Missing data pack mod:structory
[16:45:01] [ServerMain/WARN]: Missing data pack mod:journeymap
[16:45:01] [ServerMain/WARN]: Missing data pack mod:snowballsfreezemobs
[16:45:01] [ServerMain/WARN]: Missing data pack mod:naturescompass
[16:45:02] [ServerMain/WARN]: Failed to load datapacks, can't proceed with server load. You can either fix your datapacks or reset to vanilla with --safeMode

 

[The_Hyperdeity]

2 hours ago, Ugdhar said:

The problem is the save is expecting the mods it was run with, probably due to there being items/blocks/etc in the world from those mods.

Try adding --safeMode to your commandline that runs the server, and see if that works.

[16:45:01] [ServerMain/WARN]: Missing data pack mod:mr_dungeons_andtaverns
[16:45:01] [ServerMain/WARN]: Missing data pack mod:torchbowmod
[16:45:01] [ServerMain/WARN]: Missing data pack mod:the_afterdark
[16:45:01] [ServerMain/WARN]: Missing data pack mod:explorerscompass
[16:45:01] [ServerMain/WARN]: Missing data pack mod:darkloot
[16:45:01] [ServerMain/WARN]: Missing data pack mod:walljump
[16:45:01] [ServerMain/WARN]: Missing data pack mod:terralith
[16:45:01] [ServerMain/WARN]: Missing data pack mod:commonnetworking
[16:45:01] [ServerMain/WARN]: Missing data pack mod:configlibtxf
[16:45:01] [ServerMain/WARN]: Missing data pack mod:forge
[16:45:01] [ServerMain/WARN]: Missing data pack mod:journeymap_api
[16:45:01] [ServerMain/WARN]: Missing data pack mod:geophilic
[16:45:01] [ServerMain/WARN]: Missing data pack mod:collective
[16:45:01] [ServerMain/WARN]: Missing data pack mod:structory
[16:45:01] [ServerMain/WARN]: Missing data pack mod:journeymap
[16:45:01] [ServerMain/WARN]: Missing data pack mod:snowballsfreezemobs
[16:45:01] [ServerMain/WARN]: Missing data pack mod:naturescompass
[16:45:02] [ServerMain/WARN]: Failed to load datapacks, can't proceed with server load. You can either fix your datapacks or reset to vanilla with --safeMode

 

yeah but here's the thing; i didn't get into the world with the mods on, i realized i had to have the mods installed on the client and reverted it back to vanilla, and even then i tried to boot it up on safe mode in vanilla, still didn't work.

[Ugdhar]

Not really sure what you can do if the --safeMode doesn't work, to be honest. Evidently just starting the server (I assume you ran it once you added forge/mods) was enough to embed those datapacks into your save.

Hopefully there's something that can be done for you, and someone will chime in with a solution!

Good luck!

[TileEntity]

It is possible to delete these registries/entries from the level.dat via NBT Editor

https://github.com/jaquadro/NBTExplorer