[error] New reactjs Project, install Routing

Hi, I am Gael.
I’m learning ReactJs, with this tutorial.

I have an error element type, but i don’t find it.
"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."

My app.js

Can you help me please ?

Can you also show your Routes?

Hello, thanks for your time.

My Routes.js

Can you try to do this in your routes?

{ /* Finally, catch all unmatched routes */ }

Use the component prop instead. See if that gives a difference.

Sorry I don’t understand what you ask,
can you explain please?
What routes Ido try ? and I try this in my navBar ?

Do you have un exemple for use the component prop instead ? its on my app.js or on my index .js?
I show my index.js maybe my error is here.

Can I see the full error you are getting? Including the stack trace?

Hello jayair, this is my error

What is stack trace ?

Hello stcalica, thank you for this link , I’m looking.

Can you try running the app from the sample repo instead?

And compare it to your code and see what is different?