To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function

[praason]

Warning: Can't perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function.
in bound Layout (created by bound App)
in Switch (created by bound App)
in bound App
in Router