Why inventory button in items tab and estimates button in revenue tab not working?

Why inventory button in items tab and estimates button in revenue tab not working?
It always shows

(1/1) NotFoundHttpException

in RouteCollection.php line 179

at RouteCollection->match(object(Request))

in Router.php line 546

at Router->findRoute(object(Request))

in Router.php line 525

at Router->dispatchToRoute(object(Request))

in Router.php line 511

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thank you sir