Guru Kallam

Add this line to wp-config.php file, then it will work fine.

define(‘ALTERNATE_WP_CRON’, true);

I have read one article in wordpress blogs, and I added to my config file, it worked perfectly fine with my multi site.
In his discussion I learned there is nothing to do with word press, some times web server doesn’t load the wp-cron.php file contents, so if you keep the above line in config file it worked fine. and also published my previously missed schedule posts automatically

yes, me too found same problem when i was installing in multisite, but I found alternative solution it works very well.
put the plugin in your plugin directory(or just install), dont do network activate, go to each individual blog you created through network try to activate for only that blog.
do the above step for all multisite blogs