运行报这个错误，请问一下怎么改

[haheha]

Compiler message:
file:///Users/fcn2019/flutter/.pub-cache/hosted/pub.flutter-io.cn/pull_to_refresh-1.1.5/lib/src/internals/indicator_wra
p.dart:105:46: Error: The argument type 'Null Function(Null)' can't be assigned to the parameter type 'dynamic
Function(void)'.
Try changing the type of the parameter, or casting the argument to 'dynamic Function(void)'.
_sizeController.animateTo(minSpace).then((Null val) {
^
Compiler failed on /Users/fcn2019/Downloads/flutter_study-master/lib/main.dart
Error launching application on iPhone XR.

[Davisjy]

https://stackoverflow.com/questions/53475734/error-the-argument-type-→-null-cant-be-assigned-to-the-parameter-type-n
看这个

[SycamoreChina]

碰到了同样的问题，请大神明示~

[Davisjy]

@SycamoreChina then((Null val) 改成((_))

[SycamoreChina]

感谢~

[Captain-MK]

帐号密码是123456吗，登录失败

[Sundayw]

@Davisjy 这then((Null val) 改成((_))个具体在哪里改吗

[Captain-MK]

直接注释了都没事