Clearing Cache and Clearing Data from Google Play Store has been found to be the simplest and most common solution for many Errors faced during Installing or Updating the Apps. Some Errors Fixed with this methods are Error 941, Error 919, Error 921, Error 495, Error 505 etc.
This Video has been recorded on Nokia 8 running on Stock Android Oreo 8.1.0 and the same procedure can be used on any Android smartphone.

Please take the opportunity to connect and share this video with your friends and family if you find it useful.