Cannot Launch Modpacks

  • Tech Support section is for getting help with FTB related problems. If there's a repeatable issue that can be labeled as a bug, then please use the issue tracker for the pack or the app at GitHub issue trackers - If there's no repository for a pack that means that the pack is old and/or will not be updated. Bugs for older packs will not be fixed, unless they are critical.

Riddle78

Well-Known Member
Nov 28, 2016
214
63
54
Title Cannot Launch Modpacks

Launcher Type Twitch Desktop App

Modpack Regrowth and DireWolf 20 1.12

Modpack version 1.0.2 and 1.10.0 respectively

Have you modified the pack? Yes

Link to log file

Details of the issue Alterations: Optifine was added to both. No issues before now. I can guarantee that it is not the issue.

Twelve days ago,I was playing Regrowth just fine. Now,when I try to launch it,I get an error from the Minecraft Launcher,which reads as follows;

"LAUNCH FAILED - The version you are trying to play inherits properties from an unknown version."

I've tested with the only other modpack I have installed,DireWolf 20,but that gave the same error.

I've change nothing in the interim; This problem sprang up from something outside of my doing. I'm running Windows 10 64 bit.