我在从pub.dev安装新包时遇到了一些问题。我使用以下命令在根项目中创建了自己的包：
flutter create --template=package main_template

结构文件夹

我在main_template而不是lib中安装新软件包。每次在main_template中安装新软件包时，我都收到此错误：

Compiler message:
Error: Could not resolve the package 'device_info' in 'package:device_info/device_info.dart'.
sinergi_flutter_template/main_template/lib/variable/get_device_id.dart:3:8: Error: Not found: 'package:device_info/device_info.dart'
import 'package:device_info/device_info.dart';
       ^
sinergi_flutter_template/main_template/lib/variable/get_device_id.dart:9:11: Error: 'DeviceInfoPlugin' isn't a type.
    final DeviceInfoPlugin deviceInfoPlugin = DeviceInfoPlugin();
          ^^^^^^^^^^^^^^^^
sinergi_flutter_template/main_template/lib/variable/get_device_id.dart:9:47: Error: The method 'DeviceInfoPlugin' isn't defined for the class 'GetDeviceId'.
 - 'GetDeviceId' is from 'package:main_template/variable/get_device_id.dart' ('sinergi_flutter_template/main_template/lib/variable/get_device_id.dart').
Try correcting the name to the name of an existing method, or defining a method named 'DeviceInfoPlugin'.
    final DeviceInfoPlugin deviceInfoPlugin = DeviceInfoPlugin();
                                              ^^^^^^^^^^^^^^^^
U
nhandled exception:
FileSystemException(uri=org-dartlang-u
ntranslatable-uri:package%3Adevice_info%2Fdevice_info.dart; message=StandardFileSystem only supports file:* and data:* URIs)
#0      StandardFileSystem.entityForUri  (package:front_end/src/api_prototype/standard_file_system.dart:33:7)
#1      asFileUri ( (package:vm/kernel_front_end.dart:604:3)
7)
#2      writeDepfile  (package:vm/kernel_front_end.dart:799:21)
<asynchronous suspension>
#3      FrontendCompiler.compile  (package:frontend_server/frontend_server.dart:472:15)
<asynchronous suspension>
#4      _FlutterFrontendCompiler.compile (package:flut
ter_frontend_server/server.dart:38:22)
#5      starter  (package:flutter_frontend_server/server.dart:149:27)
#6      main  (file:///C:/b/s/w/ir/cache/builder/src/flutter/flutter_frontend_server/bin/starter.dart:8:30)
#7      _startIsolate.<anonymous closure>  (dart:isolate-patch/isolate_patch.dart:305:32)
#8      _RawReceivePortImpl._handleMessage  (dart:isolate-patch/isolate_patch.dart:174:12)
Target kernel_snapshot failed: Exception: Errors during snapshot creation: null
build failed.

FAILURE: Build failed with an exception.

* Where:
Script 'C:\flutter\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 780

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\flutter\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 20s
Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

直到现在我尝试安装3包[缓存网络图像，设备信息，闪屏]。和所有的包给予我这个错误。
我该怎么修呢？