Cannot set properties of undefined (setting 'order')

I’m in the process of converting an existing app to the new Pages framework.

I am having an issue where as soon as I trigger a callback, the app hangs. If I click on the callback graph, I get " Oops! The callback graph threw an error. Check the error list for details." which leads to

Cannot set properties of undefined (setting ‘order’)

I’m not sure where to look to troubleshoot this. Any ideas @AnnMarieW ?

hmm - not enough info to go on here. Can you make a minimal example that reproduces the error?

No problem. I’ll see what I can figure out and maybe that’ll lead me to an actual reproducible example.

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I was able to track this down to a non-existent component being used for an input. Nothing to do with Pages per se.