***Failed to load component "348ddc24-873a-4c72-add6-aabdb4b03432" (CrudWebPart). Original error: ***Failed to load URL 'https://localhost:4321/node_modules/react/dist/react.js' for resource 'react' in component '348ddc24-873a-4c72-add6-aabdb4b03432' (CrudWebPart). The file was not found in the server. Make sure that you are running 'gulp serve'.



npm i
npm i -g gulp
gulp serve

but I get the same error every time. These error logs are not very helpful and I've been stuck here for a while. I have no idea what's wrong.

  • did you run gulp serve?
    – willman
    Commented Feb 19, 2020 at 21:47
  • Yes, I get the error after I try to add the webpart.
    – Sayaman
    Commented Feb 19, 2020 at 21:51
  • to what page are you adding your webpart?
    – willman
    Commented Feb 19, 2020 at 21:54
  • Using on-prem workbench or online?
    – willman
    Commented Feb 19, 2020 at 21:57
  • I use the workbench on my localhost. Did you try running it?
    – Sayaman
    Commented Feb 20, 2020 at 13:19

1 Answer 1


I was able to get your webPart to load by downgrading the react version to 16.8.5.

change the dependencies section in your package.json to the below, then re-run npm install.

"dependencies": {
    "@microsoft/sp-core-library": "1.10.0",
    "@microsoft/sp-http": "^1.10.0",
    "@microsoft/sp-lodash-subset": "1.10.0",
    "@microsoft/sp-office-ui-fabric-core": "1.10.0",
    "@microsoft/sp-property-pane": "1.10.0",
    "@microsoft/sp-webpart-base": "1.10.0",
    "@types/es6-promise": "0.0.33",
    "@types/react": "16.8.8",
    "@types/react-dom": "16.8.3",
    "@types/webpack-env": "1.13.1",
    "antd": "^3.22.2",
    "axios": "^0.19.0",
    "react": "16.8.5",
    "react-dom": "16.8.5",
    "react-scripts": "3.1.1",
    "redux": "^4.0.4"

Once the webpart was loading, I found a few other runtime errors that I solved as follows:

you will want to change line 14 of Crud.tsx to
<Todolist spHttpClient={this.props.spHttpClient}></Todolist>

And modified the getToDosAsync at the bottom of Todolist.tsx:

getToDosAsync = (): Promise<any> => {
    let response = {};
    let promise = this.props.spHttpClient.get(`${this.props.siteUrl}/_api/web/lists/getbytitle('ToDo')/items`,
    response = SPHttpClient.configurations.v1).then(async(response)=>{ 
        return response.json();
    return promise;


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