Uncaught Error: A cross-origin error was thrown

[avranju94]

Hi,
when I set up the local development environment, and open http://localhost:8090/example, I am seeing a blank page with these two errors in my console browser

Uncaught Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Check the render method of App.
at createFiberFromTypeAndProps (react-dom.development.js:25088)
at createFiberFromElement (react-dom.development.js:25116)
at reconcileSingleElement (react-dom.development.js:14082)
at reconcileChildFibers (react-dom.development.js:14142)
at reconcileChildren (react-dom.development.js:17020)
at updateHostComponent (react-dom.development.js:17662)
at beginWork (react-dom.development.js:19110)
at HTMLUnknownElement.callCallback (react-dom.development.js:3942)
at Object.invokeGuardedCallbackDev (react-dom.development.js:3991)
at invokeGuardedCallback (react-dom.development.js:4053)

Uncaught Error: A cross-origin error was thrown. React doesn't have access to the actual error object in development. See https://reactjs.org/link/crossorigin-error for more information.
at Object.invokeGuardedCallbackDev (react-dom.development.js:4002)
at invokeGuardedCallback (react-dom.development.js:4053)
at beginWork$1 (react-dom.development.js:23994)
at performUnitOfWork (react-dom.development.js:22806)
at workLoopSync (react-dom.development.js:22737)
at renderRootSync (react-dom.development.js:22700)
at performSyncWorkOnRoot (react-dom.development.js:22323)
at scheduleUpdateOnFiber (react-dom.development.js:21911)
at updateContainer (react-dom.development.js:25512)
at react-dom.development.js:26051

what is the issue here? Can someone help me, please? I have attached the screenshot of the page too?