下面的步骤不起作用。dom中仍然有一个iframe。

I recently had this issue aswell.
I did couple of things to make it work. You can try these aswell.

Change the react-script version to 4.0.3 inside package.json.
Add this to package.json below the dependencies
"resolutions": { "react-error-overlay": "6.0.9" },
Install react-error-overlay v6.0.9 inside your devDependencies.
Remove your node_modules and package-lock.json.
Do npm install and check that works.
Note: After doing the above steps i had to run npm install react-error-overlay@6.0.9 again to fix this issue.

Hope this helps!!