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Trello won't load PowerUp iframe with no error


I wrote a company own PowerUp, tested it until yesterday. Everything worked fine. But today the PowerUp won't load anymore and I have no idea why I didn't change something.

Any ideas?

Thanks in advance.


1 answer

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Answer accepted

Edit on 2/12/2018: We've just launched a new Power-Up admin portal that should resolve the problems that were occurring. You can see the new admin portal at! You can read about what changes were made at And documentation for the new Power-Up can be found at


Hey Dennis,

We've recently made changes to the way we handle Custom Power-Ups that are likely the cause of the problem you're experiencing. The bad news is that it takes about five minutes for the custom Power-Up you registered to be available on your Trello board. The good news is that the Power-Ups menu is much faster!

Here is what is happening behind the scenes: previously the Trello web client would make a request to every registered Power-Up's manifest file, leaving the web client waiting on those other servers' responses. We've offloaded this responsibility to the Trello server so that when you register a Power-Up there is a task that queries your manifest every five minutes and stores the data on Trello's backend. Now, when the Trello client goes to load the Power-Up menu it only needs to query our server.

This is only a short-term solution as we are working on adding fields to the Custom Power-Up admin page that will allow you to give us the manifest's data directly.

How To Proceed

After registering a Power-Up, wait five minutes. If the Power-Up doesn't load as expected, then it is likely that our task failed to grab the data from the manifest and update our server. This can happen for a few reasons:

  1. Manifest Unavailable - Is your manifest hosted on a server that sleeps? Be sure that your manifest is highly available.
  2. Invalid SSL Certificate - Power-Ups require connector URLS and manifests to be hosted behind valid SSL certificates. Check to make sure that there are no errors in your certificate.
  3. Invalid JSON - We've all left a trailing comma in an array and had some JSON parser yell at us! 😅 Double-check your manifest and ensure it contain valid JSON.

Still stuck? Don't hesitate to reach out to We're happy to help you out!

Finally, sorry for the inconvenience. We're hopeful that a more delightful Power-Up menu experience will lead to more users enabling your awesome Power-Ups! Once we launch the new Power-Ups admin, none of these issues should persist, and the power will be in your hands.

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