我正在尝试创建一个颤振应用程序。 我成功地使用Facebook和Twitter登录。 当我尝试使用推特登录时出现问题。我的设备尚未安装在 Twitter 应用程序上，我面临空值分配问题。让任何人为这个问题提供解决方案。
E/flutter (20681): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The getter 'token' was called on null.
E/flutter (20681): Receiver: null
E/flutter (20681): Tried calling: token
E/flutter (20681): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
E/flutter (20681): #1 _LoginScreenState._loginWithTwitter (package:c2c_app/src/screens/Account/Login/login_page.dart:104:39)
E/flutter (20681): <asynchronous suspension>
E/flutter (20681): #2 _LoginScreenState._buildLoginWidget.<anonymous closure> (package:c2c_app/src/screens/Account/Login/login_page.dart:581:40)
E/flutter (20681): #3 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:706:14)
E/flutter (20681): #4 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:789:36)
E/flutter (20681): #5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
E/flutter (20681): #6 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:486:11)
E/flutter (20681): #7 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:264:5)
E/flutter (20681): #8 BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:236:7)
E/flutter (20681): #9 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
E/flutter (20681): #10 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:222:20)
E/flutter (20681): #11 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198:22)
E/flutter (20681): #12 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156:7)
E/flutter (20681): #13 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7)
E/flutter (20681): #14 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7)
E/flutter (20681): #15 _rootRunUnary (dart:async/zone.dart:1138:13)
E/flutter (20681): #16 _CustomZone.runUnary (dart:async/zone.dart:1031:19)
E/flutter (20681): #17 _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7)
E/flutter (20681): #18 _invoke1 (dart:ui/hooks.dart:273:10)
E/flutter (20681): #19 _dispatchPointerDataPacket (dart:ui/hooks.dart:182:5)
E/flutter (20681):
您只需将尝试和捕获块放入Twitter登录代码中
即可