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Error when loading card-buttons

I'd like to create a simple button on my Trello card.
To learn, I followed the Trello tutorial ( but I can't just get the button.
So I decided to use the solution available directly on the git (

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 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.

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I find the answer, i jsut should create my power Up with ""

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