ref.measurelayout must be called with a ref to a native component #593

<KeyboardAvoidingView
  behavior={Platform.OS === "ios" ? "padding" : "height"}
  style={{ flex: 1, backgroundColor: theme.background }}
  keyboardVerticalOffset={Platform.OS === "ios" ? 90 : 0}
  >
  <NestableScrollContainer ref={scrollRef} style={{ flex: 1 }}>
      {/* Other Components */
      <NestableDraggableFlatList
      	ref={flatListRef}
      	data={[...routineOrder]}
      	onDragEnd={handleDragEnd}
      	keyExtractor={(item) => item}
      	renderItem={renderRoutineItem}
      	contentContainerStyle={{ paddingBottom: 20 }}
      	activationDistance={10}
      	dragHitSlop={{ top: 10, bottom: 10, left: 10, right: 10 }}
      	containerStyle={{ flex: 1 }}
      />
      {/* Other Components */
  </NestableScrollContainer>
</KeyboardAvoidingView>