Calendar Integration in asterisk

I am getting below error when try to integrate calendar with my asterisk:

[Jan 25 10:56:30] WARNING[4982]: res_calendar_icalendar.c:117 auth_credentials: Invalid username or password for iCalendar ‘myGoogleCal’
[Jan 25 10:56:30] WARNING[4982]: res_calendar_icalendar.c:150 fetch_icalendar: Unable to retrieve iCalendar ‘myGoogleCal’ from ‘’: Could not authenticate to server: rejected Basic challenge

any one please help me to sort out this issue…

Start by authentication correctly against google