I'm not sure what is going on with Flutterflow but the way you have scrolling is impossible to understand. The error message you get is even worse. It explains NOTHING and you are forced to either delete the entire page and start over to fix so you can get scrolling on the top column of your tree or you will never get scrolling to function in the app. Just a tip if you also struggle with the most functional part of an app, scrolling to view data.
The way I resolve is just completely delete the page and start over. It sucks, but if you can't see the data, you don't really have a choice. Hopefully someday they will sort out the mess.
In the screenshot, you cannot have just part of the page scrolling. It will NEVER scroll on any device except a web browser on Mac. On Web in Safari on iPhone, it does not, on android with the app, no scrolling. It only scrolls if you can do the very top column of the tree on the page. Unfortunately you get the error more times than not. scroll