My blightfall world won't load and results in a crash

[Toby Peter]

 Type of Bug: In-Game Bug

- Reproduction rate: 10/10 (everytime)

- Steps to reproduce:

Opened Technic Launcher

started Blightfall

Blightfall loads

Load my world "waowh" (The name of the world)

Blightfall crashes

Back to Techic Launcher menu

- Expected result: My Blightfall world should load and be ready to play.

- Observed result: Blightfall crashes and the launcher menu reappears

- Logs: Launcher Log: 

https://paste.ubuntu.com/p/wX6HvXS6YB/  (Technic launcher crash report)

- Additional Comments:

This world was an old world that tried to put back into a new blightfall modpack. 

I have since then, switch my Minecraft/Mojang-name (DK_toby to TobyCoff)

also, as I said the world is old, from 2015 august I think (but the last time I used the world, was 2019 august-september).