Unable to create dart snapshot for flutter tool

Question

  flutter upgrade
Building flutter tool...
Running pub upgrade...
Resolving dependencies... (8.1s)
Got dependencies.
AppData/Local/Pub/Cache/hosted/pub.dev/http-0.13.6/lib/src/base_request.dart:144:7: Error: The getter 'drethrow' isn't defined for the class 'BaseRequest'.
 - 'BaseRequest' is from 'package:http/src/base_request.dart' ('AppData/Local/Pub/Cache/hosted/pub.dev/http-0.13.6/lib/src/base_request.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'drethrow'.
      drethrow;
      ^^^^^^^^
AppData/Local/Pub/Cache/hosted/pub.dev/http-0.13.6/lib/src/base_request.dart:129:28: Error: A non-null value must be returned since the return type 'StreamedResponse' doesn't allow null.
 - 'StreamedResponse' is from 'package:http/src/streamed_response.dart' ('AppData/Local/Pub/Cache/hosted/pub.dev/http-0.13.6/lib/src/streamed_response.dart').
  Future<StreamedResponse> send() async {
                           ^
Error: Unable to create dart snapshot for flutter tool.

I wanted to update Flutter when I ran into this problem. And I can't run my project at all, as if Flutter was not installed at all

I want to be able to update and output

Answer 1

You were most probably looking at the source code of the http package the dart pub tool downloaded to your computer and accidentally pressed a d on your keyboard in AppData/Local/Pub/Cache/hosted/pub.dev/http-0.13.6/lib/src/base_request.dart on line 144 and this made the code incompilable. Go to this file and remove the d or run dart pub cache repair to redownload all the packages in your pub cache.

Try correcting the name to the name of an existing getter, or defining a getter or field named 'drethrow'.
      drethrow;
      ^^^^^^^^

The cause was clearly stated in the error you were getting.