You Are Great Klas!!!!
Thank you, Thank you, Thank you!!!
As per your reply first of all I tried to change error reporting from "system default" to "maximum" but it does not make any change and no error displayed.
then I put the below mentioned 2 lines into the index.php file of the joomla root (main file of the site):
ini_set('max_execution_time', 300); //300 seconds = 5 minutes
ini_set('memory_limit','512M');
Now the list is working!
Hope it will help someone, sometime!