错误：未找到：'dart:ui' import 'dart:ui' - Flutter

Question

I've cloned a certain repository from Github to my VSCode Editor but this is the output every time I try running the code.

[Running] dart "/home/linusanari_/Documents/Flutterprojects/hopOn/lib/main.dart" lib/main.dart: Warning: Interpreting this as package URI, 'package:vehicle_sharing_app/main.dart'. ../../../snap/flutter/common/flutter/packages/flutter/lib/src/cupertino/action_sheet.dart:5:8: Error: Not found: 'dart:ui' import 'dart:ui' show ImageFilter; ^../../../snap/flutter/common/flutter/packages/flutter/lib/src/cupertino/bottom_tab_bar.dart:5:8: Error: Not found: 'dart:ui' import 'dart:ui' show ImageFilter; ^../../../snap/flutter/common/flutter/packages/flutter/lib/src/cupertino/colors.dart:5:8: Error: Not found: 'dart:ui' import 'dart:ui' show Color, Brightness; ^../../../snap/flutter/common/flutter/packages/flutter/lib/src/cupertino/context_menu.dart:6:8: Error: Not found: 'dart:ui' import 'dart:ui' as ui; ^../../../snap/flutter/common/flutter/packages/flutter/lib/src/cupertino/dialog.dart:6:8: Error: Not found: 'dart:ui' import 'dart:ui' show ImageFilter; ^../../../snap/flutter/common/flutter/packages/flutter/lib/src/cupertino/nav_bar.dart:6:8: Error: Not found: 'dart:ui' import 'dart:ui' show ImageFilter; ^../../../snap/flutter/common/flutter/packages/flutter/lib/src/cupertino/route.dart:6:8: Error: Not found: 'dart:ui' import 'dart:ui' show lerpDouble, ImageFilter; ^../../../snap/flutter/common/flutter/packages/flutter/lib/src/cupertino/slider.dart:6:8: Error: Not found: 'dart:ui' import 'dart:ui' show lerpDouble; ^../../../snap/flutter/common/flutter/packages/flutter/lib/src/cupertino/switch.dart:5:8: Error: Not found: 'dart:ui' import 'dart:ui' show lerpDouble; ^../../../snap/flutter/common/flutter/packages/flutter/lib/src/cupertino/text_field.dart:5:8: Error: Not found: 'dart:ui' import 'dart:ui' as ui show BoxHeightStyle, BoxWidthStyle; ^

[Done] exited with code=254 in 15.987 seconds

Any insight/help will be much appreciated.

Answer 1

There are some bugs in VSCode about library getting. You should try several time these flow until error fixed.

 flutter clean flutter pub get

Answer 2

To run an Flutter project in VS Code use menu "Execute > Start Debugging (F5)" or menu "Execute > Start Without Debugging (Ctrl+F5)".

Do NOT use "Run Code" button (triangle icon on upper right corner of edit window), because VS Code will try to run only that file, and not the whole project, what generates error messages like "Error: Not found: 'dart:ui'".

Answer 3

This may be irrelevant in your case, but I had this issue when I tried to execute flutter pub run package:entry .

What solved the issue for me, was:

• Check all the imports. You shouldn't create imports from inside the library that have the library name in it. Best to replace those with only relative imports.
• I had an issue where two extension declarations were in one file. After I moved them into separate files, it worked.

Key thing is to try to narrow down the issue by importing only a few files and see when it starts to break. Yes, I know this is not a professional advice, but flutter projects behave weird sometimes.

Answer 4

enter image description here here I have a solution

Answer 5

I got that error when I loaded the 'lib' folder (that contains only.dart files) instead of loading the project folder that contains 'pubspec.yaml, ios, linux, android, lib...'.