Grey screen in run mode

Test mode is working fine but when I run my app in run mode, the splash screen comes up after which it only shows grey screen.

In the console, the error I see is: "NoSuchMethodError: method not found: 'r' on null".

Here is the link to run mode of the app: https://app.flutterflow.io/run/LVwR31c0Q0Y7SJLiOBk7

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