error with this plugin !

Hello !

if I use it liket that:
[gcal-table url=https://www.google.com/calendar/feeds/url/basic]

Warning: file_get_contents() [function.file-get-contents]: Unable to access https://www.google.com/calendar/feeds/url/url/full?singleevents=true&futureevents=true&orderby=starttime&sortorder=a in /mnt/113/sdb/c/2/domainname/wp-content/plugins/gcal-table/gcal-table.php on line 38

Warning: file_get_contents(https://www.google.com/calendar/feeds/url/full?singleevents=true&futureevents=true&orderby=starttime&sortorder=a) [function.file-get-contents]: failed to open stream: No such file or directory in /mnt/113/sdb/c/2/domainname/wp-content/plugins/gcal-table/gcal-table.php on line 38

Warning: Invalid argument supplied for foreach() in /mnt/113/sdb/c/2/domainname/wp-content/plugins/gcal-table/gcal-table.php on line 45

but I think i can use https with my server.

If I use
[gcal-table url=http://www.google.com/calendar/feeds/url/basic]

it’s better but:

Warning: Invalid argument supplied for foreach() in /mnt/113/sdb/c/2/aschu.roller/wp-content/plugins/gcal-table/gcal-table.php on line 45

I don’t understand why..
could you help me ?

thx !

http://wordpress.org/plugins/gcal-table/