It seems that the various methods of calendar integration have not been working well. The [tutorial on worg](http://orgmode.org/worg/org-tutorials/org-google-sync.html) is outdated and the function is now called `org-icalender-export-to-ics`. However running this function on an `.org` file gives me an `.ics` file which does not have any entry:

```
BEGIN:VCALENDAR
VERSION:2.0
X-WR-CALNAME:Personal
PRODID:-//Xiang Ji//Emacs with Org mode//EN
X-WR-TIMEZONE:HKT
X-WR-CALDESC:
CALSCALE:GREGORIAN
END:VCALENDAR

```

I used to use `mobileorg` to directly sync with Google Calendar on Android. However the project has long been out of maintenance and recently I haven't been able to sync any of my org files with `mobileorg` at all, with various undecipherable errors occuring.

All I need is to sync those entries with `SCHEDULED` and `DEADLINE` to my calendar so that I can also check on them when I'm on my cellphone.

There has been [a similar question](https://www.reddit.com/r/emacs/comments/2mg1q0/syncing_between_orgmode_and_google_calendar/) on Reddit but none of the solutions mentioned there have been able to achieve this end.