Are you able to upload a version of your game somewhere that we can take a look at? It appears the links in the stacktrace you gave are no longer valid.
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Hello =) !
http://localhost:8060/tmp_js_export.html
I'm kiding :p
https://theludovyc.itch.io/mondernierjour
My repo is yours https://github.com/theludovyc/Godot_MonDernierJour
Have a nice dev :) !
Which browser?
I do not see the error in Chrome. As mentioned in the topic, we’re using a header that isn’t widely available for the game page embed. It only works on Chrome right now.
You can, however, use the embed from here to get a new URL that should work on all browsers: https://itch.io/game/upload-embed/282067
For example, your game is available here: https://itch.io/embed-upload/5608527?color=333333