"The page can't load Google maps correctly"

When I tried to load google map using angular leaflet directive,the above mentioned error message was displayed.
How can I detect the error event from my script file??
I read the documentation.But couldn't find any way??

Please help.

Leaflet version I'm using: 0.7.7
Browser (with version) I'm using:Chrome 58
OS/Platform (with version) I'm using: Ubuntu 16