title: Installed Build Tools revision 31.0.0 is corrupted. Remove and install again using the SDK Manager
body: <p>Installed Build Tools revision 31.0.0 is corrupted. Remove and install again using the SDK Manager.</p>
  <p>Studio Version 4.2.1</p>
  <p>Tried Reinstalling and removing previous versions
  Tried adding dx.jar and dx.bat from build-tools-30.0.3 (This is not a good solution even after adding it shows dx.jar file is not there)</p>