title: Session 'app': error when trying to run app
body: <p>I haven't been working in Android Studio last 2 weeks, now i come back to change something in my app, and i can't debug apps anymore on my smartphone.</p>
  
  <p>I get this Event Log:</p>
  
  <pre><code>21:55:16 Gradle build finished in 4 sec
  21:55:16 Session 'app': running
  21:55:20 Session 'app': error
  </code></pre>
  
  <p>And my app doesn't start at all. This happens with all projects and they used to run on same device before perfectly. Apps are still working on Genymotion, but not on my smartphone.</p>
  
  <p>I tried restarting everyting (AS, pc, phone) but nothing helped. There was exact same problem posted, but they got nothing. When trying to google i find only 3 relevant results, so probably very rare problem.</p>
  
  <p>Logs aren't showing any unusual errors. </p>