[undefined] is not a <Route> component. All component children of <Routes> must be a <Route> or <React.Fragment>

[nitzanma]

Hello,
I'm working on a React+Mobx+Typescript Web Application.
I'm migrating to v6 from v5 using this guide (with react-router-dom-v5-compat):
#8753

Now I'm in step 4: Convert Switch to Routes.

Before started this step - everything was complied and running successfully.
After completing it - I get this error on run time:
[undefined] is not a component. All component children of must be a or <React.Fragment>

with no idea why.
tried to search the web for it, but couldn't find anything helpful.

Can anyone please assist?
Thanks!