我使用create-react app创建一个新的react应用程序，当我尝试使用命令npm start启动它时，它返回以下错误：
> [email protected] start
/mnt/c/Users/Debchakra/Desktop/warbler/warbler-client
> react-scripts start
There might be a problem with the project dependency tree.
It is likely not a bug in Create React App, but something you need to fix
locally.
The react-scripts package provided by Create React App requires a
dependency:
"webpack": "4.28.3"
Don't try to install it manually: your package manager does it
automatically.
However, a different version of webpack was detected higher up in the
tree:
/mnt/c/Users/Debchakra/node_modules/webpack (version: 4.29.5)
Manually installing incompatible versions is known to cause hard-to-debug
issues.
If you would prefer to ignore this check, add SKIP_PREFLIGHT_CHECK=true to
an .env file in your project.
That will permanently disable this message but you might encounter other
issues.
To fix the dependency tree, try following the steps below in the exact
order:
1. Delete package-lock.json (not package.json!) and/or yarn.lock in your
project folder.
2. Delete node_modules in your project folder.
3. Remove "webpack" from dependencies and/or devDependencies in the
package.json file in your project folder.
4. Run npm install or yarn, depending on the package manager you use.
In most cases, this should be enough to fix the problem.
If this has not helped, there are a few other things you can try:
5. If you used npm, install yarn (http://yarnpkg.com/) and repeat the
above steps with it instead.
This may help because npm has known issues with package hoisting
which may get resolved in future versions.
6. Check if /mnt/c/Users/Debchakra/node_modules/webpack is outside your
project directory.
For example, you might have accidentally installed something in your
home folder.
7. Try running npm ls webpack in your project folder.
This will tell you which other package (apart from the expected
react-scripts) installed webpack.
If nothing else helps, add SKIP_PREFLIGHT_CHECK=true to an .env file in
your project.
That would permanently disable this preflight check in case you want to
proceed anyway.
P.S. We know this message is long but please read the steps above :-) We
hope you find them helpful!
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] start script.
npm ERR! This is probably not a problem with npm. There is likely
additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /home/webdeb/.npm/_logs/2019-03-26T06_44_19_294Z-debug.log
我尝试了上面提到的所有步骤，比如安装纱线和所有这些，但它总是显示相同的错误。
以前，我已经在cloud9中使用了create-react-app，它工作得很好，但现在我在我的本地系统上做了。我实际上使用的是WSL。 （如果有帮助的话）
您已经在系统上全局安装了一个webpack版本（/mnt/c/Users/Debchakra/node_modules/webpack (version: 4.29.5)），该版本与create-react-app所需的版本不匹配。
通过npm uninstall -g webpack卸载全局版本应该解决它。