android studio space

1<Space
2//adding space and changing the data will effekt the size of the Space / gap
3  android:layout_width="wrap_conent"
4  android:layout_height="30dp"/>
5    
6//space is working but showing up as *Red* ("Error") on an androidx project
7<androidx.legacy.widget.Space
8  android:layout_width="match_parent"
9  android:layout_height="15dp" />