title: Android Error 961 during install
body: <p>A user of my Android application called RouterCheck has reported receiving a 961 error during the installation. Going to Google, it isn't difficult to find info on how to solve this - mainly by clearing data and/or cache.</p>
  
  <p>The app itself isn't big. The APK is under 3MB and it unzips into a bit over 6Mb.</p>
  
  <p>So my question is: Have I as the app developer done anything to cause this problem, or is it really due to the state of the customer's phone? Is there anything I should do to help prevent future customers from getting the same problem?</p>