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创建flutter项目，但是无法识别设备或模拟器，请问什么原因，报出的异常如下：
Flutter device daemon #4: process exited during startup. Exit code: 255, stderr: Unhandled exception: NoSuchMethodError: The method 'split' was called on null. Receiver: null Tried calling: split(":") #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5) #1 getExecutablePath (package:process/src/interface/common.dart:77:60) #2 _getExecutable (package:process/src/interface/local_process_manager.dart:125:16) #3 LocalProcessManager.runSync (package:process/src/interface/local_process_manager.dart:94:30) #4 _runWithLoggingSync (package:flutter_tools/src/base/process.dart:349:48) #5 runSync (package:flutter_tools/src/base/process.dart:321:10) #6 _runGit (package:flutter_tools/src/version.dart:535:10) #7 new FlutterVersion (package:flutter_tools/src/version.dart:23:26) #8 runInContext. (package:flutter_tools/src/context_runner.dart:85:29) #9 AppContext._generateIfNecessary. (package:flutter_tools/src/base/context.dart:99:41) #10
Flutter device daemon #4: process exited during startup. Exit code: 255, stderr: Unhandled exception: NoSuchMethodError: The method 'split' was called on null. Receiver: null Tried calling: split(":") #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5) #1 getExecutablePath (package:process/src/interface/common.dart:77:60) #2 _getExecutable (package:process/src/interface/local_process_manager.dart:125:16) #3 LocalProcessManager.runSync (package:process/src/interface/local_process_manager.dart:94:30) #4 _runWithLoggingSync (package:flutter_tools/src/base/process.dart:349:48) #5 runSync (package:flutter_tools/src/base/process.dart:321:10) #6 _runGit (package:flutter_tools/src/version.dart:535:10) #7 new FlutterVersion (package:flutter_tools/src/version.dart:23:26) #8 runInContext. (package:flutter_tools/src/context_runner.dart:85:29) #9 AppContext._generateIfNecessary. (package:flutter_tools/src/base/context.dart:99:41) #10
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