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answer Another exception was thrown: 'package:flutter/src/widgets/navigator.dart': Failed assertion: line 5299 pos 12: '!_debugLocked': is not true.

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'package:flutter/src/widgets/navigator.dart': failed assertion: line 3524 pos 12: '!_debuglocked': is not true.

package:flutter/src/widgets/navigator.dart': failed assertion: line 4517 pos 12: '!_debuglocked': is not true.

AssertionError ('package:flutter/src/material/bottom_navigation_bar.dart': Failed assertion: line 188 pos 9: 'items.every((BottomNavigationBarItem item) => item.label != null)': Every item must have a non-null label)

package:flutter/src/material/text_form_field.dart': Failed assertion: line 157 pos 15: 'initialValue == null || controller == null': is not true.

AssertionError ('package:flutter/src/material/bottom_navigation_bar.dart': Failed assertion: line 188 pos 9: 'items.every((BottomNavigationBarItem item) => item.label != null)': Every item must have a non-null label)

unhandled exception: 'package:flutter/src/widgets/navigator.dart': failed assertion: line 2416 pos 18: '!navigator._debuglocked': is not true.

'package:flutter/src/widgets/navigator.dart': failed assertion: line 4517 pos 12: '!_debuglocked': is not true.

Error: Assertion failed: org-dartlang-sdk:///flutter_web_sdk/lib/_engine/engine/navigation/history.dart:284:14 _userProvidedRouteName != null is not true

'package:flutter/src/widgets/basic.dart': Failed assertion: line 2671 pos 15: 'heightFactor == null || heightFactor >= 0.0': is not true.

'package:flutter/src/widgets/basic.dart': Failed assertion: line 2671 pos 15: 'heightFactor == null || heightFactor >= 0.0': is not true.

'package:flutter/src/widgets/framework.dart': failed assertion: line 4313 pos 14: 'owner!._debugcurrentbuildtarget == this': is not true.

AssertionError ('package:flutter/src/material/bottom_navigation_bar.dart': Failed assertion: line 188 pos 9: 'items.every((BottomNavigationBarItem item) => item.label != null)': Every item must have a non-null label)

'package:flutter/src/widgets/framework.dart': Failed assertion: line 5020 pos 16: 'owner!._debugCurrentBuildTarget == this': is not true.

assertion failed flutter

The following assertion was thrown during layout: I/flutter ( 9849): A RenderFlex overflowed by 17 pixels on the right. I/flutter ( 9849): I/flutter ( 9849): The relevant error-causing widget was: I/flutter ( 9849): DropdownButtonFormField<String> I/flutt