Web Reference: ClassNotFoundException (String s, Throwable ex) Constructs a ClassNotFoundException with the specified detail message and optional exception that was raised while loading the class. I had this issue in an Android application that needed an Application class which was created in wrong path inside the Android Studio project. When I moved the class file to the correct package, it was fixed. Nov 16, 2025 · The Android system cannot locate your `MainActivity` class during app initialization, often due to issues in configuration, build processes, or tooling. Since this happens before your app’s code executes, debugging can feel like searching for a needle in a haystack.
YouTube Excerpt: In this video, we dive deep into one of the most frustrating issues
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