محمد امین عالی
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سلام دوستان من فلاتر خودم آپدیت کردم و این ارور میده وقتی ران میکنم

Compiler message:
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:7:8: Error: Error when reading '/C:/flutter/.pub-cache/hosted/pub.dartlang.org/collection-1.14.11/lib/collection.dart': The system cannot find the path specified.

import 'package:collection/collection.dart';
       ^
/C:/flutter/packages/flutter/lib/src/widgets/shortcuts.dart:7:8: Error: Error when reading '/C:/flutter/.pub-cache/hosted/pub.dartlang.org/collection-1.14.11/lib/collection.dart': The system cannot find the path specified.

import 'package:collection/collection.dart';
       ^
/C:/flutter/packages/flutter/lib/src/scheduler/binding.dart:10:8: Error: Error when reading '/C:/flutter/.pub-cache/hosted/pub.dartlang.org/collection-1.14.11/lib/collection.dart': The system cannot find the path specified.

import 'package:collection/collection.dart' show PriorityQueue, HeapPriorityQueue;
       ^
/C:/flutter/packages/flutter/lib/src/scheduler/binding.dart:375:9: Error: Type 'PriorityQueue' not found.
  final PriorityQueue<_TaskEntry<dynamic>> _taskQueue = HeapPriorityQueue<_TaskEntry<dynamic>>(_taskSorter);
        ^^^^^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/scheduler/binding.dart:375:9: Error: Expected 0 type arguments.
  final PriorityQueue<_TaskEntry<dynamic>> _taskQueue = HeapPriorityQueue<_TaskEntry<dynamic>>(_taskSorter);
        ^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:464:5: Error: The method 'mergeSort' isn't defined for the class 'DirectionalFocusTraversalPolicyMixin'.
 - 'DirectionalFocusTraversalPolicyMixin' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
    mergeSort<FocusNode>(sorted, compare: (FocusNode a, FocusNode b) {
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:504:5: Error: The method 'mergeSort' isn't defined for the class 'DirectionalFocusTraversalPolicyMixin'.
 - 'DirectionalFocusTraversalPolicyMixin' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
    mergeSort<FocusNode>(sorted, compare: (FocusNode a, FocusNode b) => a.rect.center.dx.compareTo(b.rect.center.dx));
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:529:5: Error: The method 'mergeSort' isn't defined for the class 'DirectionalFocusTraversalPolicyMixin'.
 - 'DirectionalFocusTraversalPolicyMixin' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
    mergeSort<FocusNode>(sorted, compare: (FocusNode a, FocusNode b) => a.rect.center.dy.compareTo(b.rect.center.dy));
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:717:9: Error: The method 'mergeSort' isn't defined for the class 'DirectionalFocusTraversalPolicyMixin'.
 - 'DirectionalFocusTraversalPolicyMixin' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
        mergeSort<FocusNode>(sorted, compare: (FocusNode a, FocusNode b) {
        ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:749:9: Error: The method 'mergeSort' isn't defined for the class 'DirectionalFocusTraversalPolicyMixin'.
 - 'DirectionalFocusTraversalPolicyMixin' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
        mergeSort<FocusNode>(sorted, compare: (FocusNode a, FocusNode b) {
        ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:847:5: Error: Method not found: 'mergeSort'.
    mergeSort<_ReadingOrderSortData>(list, compare: (_ReadingOrderSortData a, _ReadingOrderSortData b) {
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:920:5: Error: Method not found: 'mergeSort'.
    mergeSort<_ReadingOrderDirectionalGroupData>(list, compare: (_ReadingOrderDirectionalGroupData a, _ReadingOrderDirectionalGroupData b) {
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:1001:5: Error: The method 'mergeSort' isn't defined for the class 'ReadingOrderTraversalPolicy'.
 - 'ReadingOrderTraversalPolicy' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
    mergeSort<_ReadingOrderSortData>(candidates, compare: (_ReadingOrderSortData a, _ReadingOrderSortData b) => a.rect.top.compareTo(b.rect.top));
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:1349:5: Error: The method 'mergeSort' isn't defined for the class 'OrderedTraversalPolicy'.
 - 'OrderedTraversalPolicy' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
    mergeSort<_OrderedFocusInfo>(ordered, compare: (_OrderedFocusInfo a, _OrderedFocusInfo b) {
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/shortcuts.dart:81:22: Error: The method 'UnmodifiableSetView' isn't defined for the class 'KeySet<T>'.
 - 'KeySet' is from 'package:flutter/src/widgets/shortcuts.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/shortcuts.dart').
Try correcting the name to the name of an existing method, or defining a method named 'UnmodifiableSetView'.
  Set<T> get keys => UnmodifiableSetView<T>(_keys);
                     ^^^^^^^^^^^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/scheduler/binding.dart:375:9: Error: 'PriorityQueue' isn't a type.
  final PriorityQueue<_TaskEntry<dynamic>> _taskQueue = HeapPriorityQueue<_TaskEntry<dynamic>>(_taskSorter);
        ^^^^^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/scheduler/binding.dart:375:57: Error: Method not found: 'HeapPriorityQueue'.
  final PriorityQueue<_TaskEntry<dynamic>> _taskQueue = HeapPriorityQueue<_TaskEntry<dynamic>>(_taskSorter);
                                                        ^^^^^^^^^^^^^^^^^

Compiler message:
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:7:8: Error: Error when reading '/C:/flutter/.pub-cache/hosted/pub.dartlang.org/collection-1.14.11/lib/collection.dart': The system cannot find the path specified.

import 'package:collection/collection.dart';
       ^
/C:/flutter/packages/flutter/lib/src/widgets/shortcuts.dart:7:8: Error: Error when reading '/C:/flutter/.pub-cache/hosted/pub.dartlang.org/collection-1.14.11/lib/collection.dart': The system cannot find the path specified.

import 'package:collection/collection.dart';
       ^
/C:/flutter/packages/flutter/lib/src/scheduler/binding.dart:10:8: Error: Error when reading '/C:/flutter/.pub-cache/hosted/pub.dartlang.org/collection-1.14.11/lib/collection.dart': The system cannot find the path specified.

import 'package:collection/collection.dart' show PriorityQueue, HeapPriorityQueue;
       ^
/C:/flutter/packages/flutter/lib/src/scheduler/binding.dart:375:9: Error: Type 'PriorityQueue' not found.
  final PriorityQueue<_TaskEntry<dynamic>> _taskQueue = HeapPriorityQueue<_TaskEntry<dynamic>>(_taskSorter);
        ^^^^^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/scheduler/binding.dart:375:9: Error: Expected 0 type arguments.
  final PriorityQueue<_TaskEntry<dynamic>> _taskQueue = HeapPriorityQueue<_TaskEntry<dynamic>>(_taskSorter);
        ^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:464:5: Error: The method 'mergeSort' isn't defined for the class 'DirectionalFocusTraversalPolicyMixin'.
 - 'DirectionalFocusTraversalPolicyMixin' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
    mergeSort<FocusNode>(sorted, compare: (FocusNode a, FocusNode b) {
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:504:5: Error: The method 'mergeSort' isn't defined for the class 'DirectionalFocusTraversalPolicyMixin'.
 - 'DirectionalFocusTraversalPolicyMixin' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
    mergeSort<FocusNode>(sorted, compare: (FocusNode a, FocusNode b) => a.rect.center.dx.compareTo(b.rect.center.dx));
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:529:5: Error: The method 'mergeSort' isn't defined for the class 'DirectionalFocusTraversalPolicyMixin'.
 - 'DirectionalFocusTraversalPolicyMixin' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
    mergeSort<FocusNode>(sorted, compare: (FocusNode a, FocusNode b) => a.rect.center.dy.compareTo(b.rect.center.dy));
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:717:9: Error: The method 'mergeSort' isn't defined for the class 'DirectionalFocusTraversalPolicyMixin'.
 - 'DirectionalFocusTraversalPolicyMixin' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
        mergeSort<FocusNode>(sorted, compare: (FocusNode a, FocusNode b) {
        ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:749:9: Error: The method 'mergeSort' isn't defined for the class 'DirectionalFocusTraversalPolicyMixin'.
 - 'DirectionalFocusTraversalPolicyMixin' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
        mergeSort<FocusNode>(sorted, compare: (FocusNode a, FocusNode b) {
        ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:847:5: Error: Method not found: 'mergeSort'.
    mergeSort<_ReadingOrderSortData>(list, compare: (_ReadingOrderSortData a, _ReadingOrderSortData b) {
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:920:5: Error: Method not found: 'mergeSort'.
    mergeSort<_ReadingOrderDirectionalGroupData>(list, compare: (_ReadingOrderDirectionalGroupData a, _ReadingOrderDirectionalGroupData b) {
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:1001:5: Error: The method 'mergeSort' isn't defined for the class 'ReadingOrderTraversalPolicy'.
 - 'ReadingOrderTraversalPolicy' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
    mergeSort<_ReadingOrderSortData>(candidates, compare: (_ReadingOrderSortData a, _ReadingOrderSortData b) => a.rect.top.compareTo(b.rect.top));
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart:1349:5: Error: The method 'mergeSort' isn't defined for the class 'OrderedTraversalPolicy'.
 - 'OrderedTraversalPolicy' is from 'package:flutter/src/widgets/focus_traversal.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/focus_traversal.dart').
Try correcting the name to the name of an existing method, or defining a method named 'mergeSort'.
    mergeSort<_OrderedFocusInfo>(ordered, compare: (_OrderedFocusInfo a, _OrderedFocusInfo b) {
    ^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/widgets/shortcuts.dart:81:22: Error: The method 'UnmodifiableSetView' isn't defined for the class 'KeySet<T>'.
 - 'KeySet' is from 'package:flutter/src/widgets/shortcuts.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/shortcuts.dart').
Try correcting the name to the name of an existing method, or defining a method named 'UnmodifiableSetView'.
  Set<T> get keys => UnmodifiableSetView<T>(_keys);
                     ^^^^^^^^^^^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/scheduler/binding.dart:375:9: Error: 'PriorityQueue' isn't a type.
  final PriorityQueue<_TaskEntry<dynamic>> _taskQueue = HeapPriorityQueue<_TaskEntry<dynamic>>(_taskSorter);
        ^^^^^^^^^^^^^
/C:/flutter/packages/flutter/lib/src/scheduler/binding.dart:375:57: Error: Method not found: 'HeapPriorityQueue'.
  final PriorityQueue<_TaskEntry<dynamic>> _taskQueue = HeapPriorityQueue<_TaskEntry<dynamic>>(_taskSorter);
                                                        ^^^^^^^^^^^^^^^^^
Target kernel_snapshot failed: Exception: Errors during snapshot creation: null
build failed.

FAILURE: Build failed with an exception.

* Where:
Script 'C:\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 882

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\flutter\bin\flutter.bat'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 15s
Exception: Gradle task assembleDebug failed with exit code 1

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