앞으로는 carousel-item에 key를 지정하지 말자..

client/src/components/Schedule/ScheduleCarousel.js

@@ -28,7 +28,7 @@ const ScheduleCarousel = () => {
             <div className="carousel-inner">
                 {scheduleList.length !== 0 ?
                     scheduleList.map((schedule, idx) =>
-                        <div key={idx} className={"carousel-item" + (idx === 0 ? " active" : "")}>
+                        <div className={"carousel-item " + (idx === 0 ? "active" : "")}>
                             <KU key={idx} schedule={schedule} />
                         </div>) : null}
             </div>