fix

public/react/config-overrides.js

@@ -59,7 +59,7 @@ let instance = new HardSourceWebpackPlugin({
 
 module.exports = override(
   disableEsLint(),
-  addBundleVisualizer(),
+  // addBundleVisualizer(),
   addWebpackAlias({
     "educoder": path.resolve(__dirname, 'src/common/educoder.js')
   }),

public/react/src/App.js

@@ -663,7 +663,7 @@ class App extends Component {
 								render={
 									(props) => {
 										return (<JupyterTPI {...this.props} {...props} {...this.state} />)
-									}
+									}}
 								/>
 
 								<Route path="/myproblems/record_detail/:id"