NoSuchMethodError

[shivamkg0604]

I am geeting nosuchmethoderror.I have copied the code .
but getting this error.
════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The following NoSuchMethodError was thrown building Builder:
The method '[]' was called on null.
Receiver: null
Tried calling:

The relevant error-causing widget was:
MaterialApp file:///C:/Users/shiva/AndroidStudioProjects/Clima-Flutter/lib/main.dart:9:12
When the exception was thrown, this was the stack:
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
#1 _LocationScreenState.update. (package:clima/screens/location_screen.dart:26:25)
#2 State.setState (package:flutter/src/widgets/framework.dart:1267:30)
#3 _LocationScreenState.update (package:clima/screens/location_screen.dart:25:5)
#4 _LocationScreenState.initState (package:clima/screens/location_screen.dart:21:5)
...
════════════════════════════════════════════════════════════════════════════════════════════════════
E/UIFirst (23085): failed to open /proc/23085/stuck_info, No such file or directory
Lost connection to device.

[azinmapar]

How did you solve it?? I have the same issue