Non-nullable instance field '_bmi' must be initialized.

[hodakl099]

if you have this issue, mark the variable _bmi with late key word.
late double _bmi;

[deepraj02]

Same here tried every trick in the dictionary didn't worked!

[hodakl099]

@deepraj02
mark the property late this error because of null safety for more information read https://dart.dev/null-safety
i handled it this way
late double _bmi;

[deepraj02]

Thank you soo much brother, however I tried this method too but at that time my app crashed
Anyways Thank you again..💪

[tobe-nna]

in Calculatorbrain class make sure that in calculateBMI function, bmi was aslo initialised as _bmi

[hacker0id]

this issue has come up with latest updates in Dart.

[hodakl099]

@hacker0id can you post the error

[hacker0id]

@hacker0id can you post the error

even when I set the property to late it still shows late initialisation error and the only solution I came around was to initialise the variable

[hodakl099]

The reason of this error that when you use a late variable before its initialization.
it's depends on your use case, when you need to use late initializing. if you use late initializing var make sure to assign to a value before passing it to a widget.