ERROR Warning: useEffect must not return anything besides a function, which is used for clean-up.
It looks like you wrote useEffect(async () => ...) or returned a Promise. Instead, write the async function inside your effect and call it immediately:
useEffect(() => { async function fetchData() { // You can await here const response = await MyAPI.getData(someId); // ... } fetchData(); }, [someId]); // Or [] if effect doesn't need props or state
Learn more about data fetching with Hooks: https://reactjs.org/link/hooks-data-fetching in Repositorios (created by SceneView) in StaticContainer in EnsureSingleNavigator (created by SceneView) in SceneView (created by SceneView) in RCTView (created by View) in View (created by DebugContainer) in DebugContainer (created by MaybeNestedStack) in MaybeNestedStack (created by SceneView) in RCTView (created by View) in View (created by SceneView) in RNSScreen (created by AnimatedComponent) in AnimatedComponent in AnimatedComponentWrapper (created by InnerScreen) in Suspender (created by Freeze) in Suspense (created by Freeze) in Freeze (created by DelayedFreeze) in DelayedFreeze (created by InnerScreen) in InnerScreen (created by Screen) in Screen (created by SceneView) in SceneView (created by NativeStackViewInner) in Suspender (created by Freeze) in Suspense (created by Freeze) in Freeze (created by DelayedFreeze) in DelayedFreeze (created by ScreenStack) in RNSScreenStack (created by ScreenStack) in ScreenStack (created by NativeStackViewInner) in NativeStackViewInner (created by NativeStackView) in RNCSafeAreaProvider (created by SafeAreaProvider) in SafeAreaProvider (created by SafeAreaInsetsContext) in SafeAreaProviderCompat (created by NativeStackView) in NativeStackView (created by NativeStackNavigator) in PreventRemoveProvider (created by NavigationContent) in NavigationContent in Unknown (created by NativeStackNavigator) in NativeStackNavigator (created by Rotas) in EnsureSingleNavigator in BaseNavigationContainer in ThemeProvider in NavigationContainerInner (created by Rotas) in Rotas (created by App) in App (created by withDevTools(App)) in withDevTools(App) in RCTView (created by View) in View (created by AppContainer) in RCTView (created by View) in View (created by AppContainer) in AppContainer in main(RootComponent)