Use of $rootScope.$apply

[Tntv]

Hi,

I wanted to understand the use of $rootScope.$apply. This lines are causing an error in my app.
Error: $digest / $apply already in progress

I know this is occuring because there is a $digest / $apply is running already in my application when the code from the angular-indexedDb is running.

However when i comment these lines in the entire file. My app works fine. Any help or information regarding the same would be greatly appreciated.

Best Regards,
TNTV33