How to Fix "Invariant Violation: 'main' Has Not Been Registered" in React Native
Your React Native app crashes on launch with an error claiming a component called "main" was never registered, even though your app clearly has an entry...
Category
React Native
Solving React Native build, runtime and platform-specific issues.
How to Resolve "Pod Install Failed: CocoaPods Could Not Find Compatible Versions"
pod install fails with CocoaPods reporting it can't find a set of pod versions that satisfy every dependency's constraints simultaneously. This is a genuine...
How to Fix "Unable to Load Script. Make Sure You're Running a Bundler" in Android
Your React Native app builds and installs on an Android device or emulator, but instead of loading your app, it shows a red error screen saying it can't find...
How to Resolve "React Native Metro Bundler Error: Failed to Construct Transformer"
Starting Metro fails before it can even begin serving your app, with an error about failing to construct a "transformer" — Metro's internal system for...
How to Fix "Gradle Build Failed With an Exception" in React Native Android
Building your React Native app for Android fails with Gradle's generic "build failed with an exception" summary, which — much like a similar summary from other...
How to Resolve "React Native iOS Build Failure: Command PhaseScriptExecution Failed"
An iOS build fails in Xcode (or via the command line) pointing at a failed "PhaseScriptExecution" step, which is Xcode's generic label for any custom build...
How to Fix "VirtualizedLists Should Never Be Nested Inside Plain ScrollViews"
Your app runs fine but logs a persistent warning about VirtualizedLists nested inside a plain ScrollView, and scroll performance on that screen may be...
How to Resolve "Error: Task :app:processDebugResources Failed" in React Native
An Android build fails at the resource-processing step, which is where Gradle compiles all your XML resources (strings, layouts, drawables, colors) into...
How to Fix "React Native fetch Network Request Failed" on Local API
Your React Native app's fetch call to a locally running API fails on a physical device or emulator, even though the exact same URL works perfectly when opened...