---
title: "NoClassDefFoundError"
canonical_url: "https://www.nutrient.io/guides/android/troubleshooting/java-lang-noclassdeffounderror/"
md_url: "https://www.nutrient.io/guides/android/troubleshooting/java-lang-noclassdeffounderror.md"
last_updated: "2026-06-09T10:38:40.793Z"
description: "Solutions for common issues and errors in Nutrient Android SDK with debugging tips and workarounds."
---

If you’re getting `java.lang.NoClassDefFoundError` inside `com.android.internal.os.ZygoteInit.main`, this usually means the native library couldn’t be loaded. A common reason for this is either an invalid or too aggressive ProGuard configuration, or stale caches.

Clean all intermediate build files (in Android Studio: Build > Clean Project) and rebuild your app to determine whether or not this is the case.

---

## Related pages

- [Multidex](/guides/android/miscellaneous/multidex.md)
- [Gradle Peer Not Authenticated](/guides/android/troubleshooting/gradle-peer-not-authenticated.md)
- [Abi Set Not Compatible](/guides/android/troubleshooting/abi-set-not-compatible.md)
- [Image size too big](/guides/android/troubleshooting/errors-and-warnings/image-size-too-big.md)
- [Vfy Warnings](/guides/android/troubleshooting/vfy-warnings.md)
- [Out Of Memory Build Error](/guides/android/troubleshooting/out-of-memory-build-error.md)