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useState(null) 하고 { MainMovieImage && 했는데도 error 뜨네요 Warning: Updating a style property during rerender (background) when a conflicting property is set (backgroundSize) can lead to styling bugs. To avoid this, don't mix shorthand and non-shorthand properties for the same value; instead, replace the shorthand with separate values. at div at MainImage (http://localhost:3000/static/js/bundle.js:781:18) at div at LandingPage (http://localhost:3000/static/js/bundle.js:615:78) at AuthenticationCheck (http://localhost:3000/static/js/bundle.js:2173:81) at Routes (http://localhost:3000/static/js/bundle.js:92612:5) at div at Suspense at App at Router (http://localhost:3000/static/js/bundle.js:92545:15) at BrowserRouter (http://localhost:3000/static/js/bundle.js:92025:5) at Provider (http://localhost:3000/static/js/bundle.js:89209:20)