Error: The argument type 'Function?' can't be assigned to the parameter type 'void Function()?'

Flutter error
Error: The argument type 'Function?' can't be assigned to the parameter type 'void Function()?'.

Flutter error solution
Instead of using Function? use VoidCallback?

[Solved] Error: The argument type 'Function?' can't be assigned to the parameter type 'void Function()?'


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[manuelsilva]

i was following a year old tutorial on making some login ui, and you just saved me hours of frustration holy shit thanks dude

[krishnak]

Error - The argument type 'Function' can't be assigned to the parameter type 'void Function()?
final voidcallback solved
thanks

[muhammadabid]

thank you, was struggling with this error
Error: The argument type 'Function?' can't be assigned to the parameter type 'void Function()?'

[creghy]

Thank you, did not expect this to work, honestly. 🙏

[mukahmad]

Nicely done, dear. It was really a troublesome error. Thank you.

[bigbronaijaupdates]

Please how i resolve this A value of type 'Null' can't be assigned to a parameter of type 'Key' in a const constructor.
Try using a subtype, or removing the keyword 'const'.

[zarfar]

Error: The argument type 'Function?' can't be assigned to the parameter type 'void Function()?'

Thank you

[vominhhieu]

please expain to me "VoidCallBack?" why was "?" in front of that , many thanks ?