Hi there,
I found a bug in your mod Traveler's Backpack (Fabric) and that is when I start mincraft with the fabric launcher and the mod, minecraft always crashes and shows me some error code.
I have also installed the mod that is described as necessary in the Traveler's Backpack mod description (Fabric API).
I hope the text is understandable i made it with googel translator because i'm really bad at english.
Ps. JoKi07

here is a screenshot of what mienecraft always shows me:

crashlog?

do you mean this?:

crash-2021-10-29_15.04.42-client.txt

You have to update fabric api

okay thanks