title: Android Studio Signed APK App not installing
body: <p>I know there are other questions similar to this but I havent found a solution to my problem. Ive made sure that no previous installation of the app was already on my phone (testing on a galaxy s6), in Android Studio in the Build Variants tab I've switched the module to release (I also have a Firebase and MainlibProj module, should I switch them to release as well?) and when I try installing it this is what I get in logcat:</p>
  
  <blockquote>
    <p>07-07 17:25:40.807 3506-3553/? W/PackageManager: Failed collect during installPackageLI
    android.content.pm.PackageParser$PackageParserException: Package /data/app/vmdl13968685.tmp/base.apk has no certificates at entry AndroidManifest.xml at android.content.pm.PackageParser.collectCertificates(PackageParser.java:1127) at android.content.pm.PackageParser.collectCertificates(PackageParser.java:1077) at com.android.server.pm.PackageManagerService.installPackageLI(PackageManagerService.java:14349) at com.android.server.pm.PackageManagerService.access$2600(PackageManagerService.java:333) at com.android.server.pm.PackageManagerService$8.run(PackageManagerService.java:11894)at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:145) at android.os.HandlerThread.run(HandlerThread.java:61) at com.android.server.ServiceThread.run(ServiceThread.java:46)</p>
  </blockquote>
  
  <p>I also get a:
  InstallAppProgress: Installation error code: -103</p>
  
  <p>That is not the full stack trace, just what is printed when I'm notified: app not installed.</p>
  
  <p>Just in case, I have Play Games Plugin for Unity in my app, dont know if that may potentially be causing the error.</p>