The Crackle app no longer supports versions of Android 5.0 and older. To continue streaming Crackle please upgrade your phone or tablet to the latest Android app in the market. Here is some more information on the version history: https://en.wikipedia.org/wiki/Android_version_history
For more information regarding how to upgrade your Android operating system see this site: https://www.techadvisor.co.uk/how-to/google-android/update-android-3614890/
The Crackle app can be downloaded through the Google Play Store and the Amazon App Store. The latest Crackle app available is Crackle 6.0.