title: adb: error: failed to copy ....... couldn't create file: Read-only file system
body: <pre><code>$ adb shell
  # mkdir data/local/tmp/testjars
  # exit
  </code></pre>
  
  <p>That works fine and gives no errors, but when I do:</p>
  
  <pre><code>$ adb push &lt;project_root_folder&gt;/app/build/outputs/apk/app-debug.apk data/local/tmp/testjar/load.apk
  </code></pre>
  
  <p>I get the error:</p>
  
  <pre><code>adb: error: failed to copy 'F:\dexclassloader\PluginSample\app\build\outputs\apk\app-debug.apk' to 'data\local\tmp\testjar\load.apk': couldn't create file: Read-only file system
  </code></pre>
  
  <p>What am I missing? How can I fix this?</p>
  
  <hr>
  
  <p>Im deploying my app on <strong>Virtual devices</strong> (<strong>Nexus 5</strong>).  </p>
  
  <blockquote>
    <p><strong>Android Studio 2.2.3</strong><br>
    Build #AI-145.3537739, built on December 2, 2016<br>
    JRE: 1.8.0_76-release-b03 amd64<br>
    JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o  </p>
    
    <p><strong>Windows 10</strong></p>
  </blockquote>