Project validation failed

Summary

i cant launch my uefn session at all, it keeps saying validation failed and my island I’ve spent countless hours on is basically non functional because of this.

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Other

Steps to Reproduce

everytime i load the island i can edit it on uefn as much as I like, but as soon as I click launch session it doesn’t work, it just says validation failed

Expected Result

usually it opens fortnite, and i can test the game and stuff

Observed Result

it just says validation failed and i cant do anything, and a list of errors

Platform(s)

Pc

Additional Notes

here is the output log

hi @Dearies
This post may help when similar thing happened
31.20 [Solved] UEFN Fix Validation Error pop up wont “Run”