Introduction to Generative AI for Software Development module 3 assignment c1m3 subnitting error

I am in Introduction to Generative AI for Software Development module 3

when I am submitting C1M3 “building a travel and flight optimazation applicaiton” I get error as

“An unexpected error occurred. Please try again later”

Although I have passed all tests , I did several times and with differents browsers, the result is the same, so that I can not get my certifcaiton too.

So can you help me ?

Please follow this thread, it’s about the same assignment.