title: RuntimeException : Didn't find class on path: DexPathList
body: <p>Yesterday everything worked fine with my project, but today I receive very weird errors : </p>
  
  <blockquote>
    <p>java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.redonbas/com.example.redonbas.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.example.redonbas.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.redonbas-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.redonbas-2, /vendor/lib, /system/lib]]</p>
  </blockquote>
  
  <p>My AndroidManifest : </p>
  
  <pre><code>&lt;activity
      android:name=".MainActivity"
      android:label="@string/app_name" &gt;
      &lt;intent-filter&gt;
          &lt;action android:name="android.intent.action.MAIN" /&gt;
          &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
      &lt;/intent-filter&gt;
  &lt;/activity&gt;
  </code></pre>
  
  <p>MainActivity is in correct package:</p>
  
  <p><img src="https://i.stack.imgur.com/Uao9G.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/xuf58.png" alt="enter image description here"></p>
  
  <p>I refered to the <a href="https://stackoverflow.com/questions/23074381/didnt-find-class-on-path-dexpathlist">problem</a> but I copied all the File System of the project to the new, but that didn't help. I also created new project with another package and manually copied all the stuff from the old project there - the problem still remains! </p>
  
  <p>What's wrong with it? </p>