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Error when loading card-buttons

Hello,
I'd like to create a simple button on my Trello card.
To learn, I followed the Trello tutorial (https://tech.trello.com/power-up-tutorial-part-one/) but I can't just get the button.
So I decided to use the solution available directly on the git (https://github.com/trello/glitch-power-up-tutorial-part-one).

On their solution there is a manifest (not mentioned in the tutorial). I used it to add my Power-Up.
However on loading I find this error in the console: "Error, timeout while initializing index iframe for https://4facc5cc.ngrok.io/manifest.json. Timeout=20000ms". The button loads then disappears because it can't create it.
If someone has already encountered this kind of problem or would have an idea of what I did wrong, I'll take it!
Thank you in advance.

Ps: the server is running during the whole time of the test.

1 answer

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Answer accepted

I find the answer, i jsut should create my power Up with "https://4facc5cc.ngrok.io"

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