Unable to move albums for Gallery

I was trying to move albums by clicking "move album" link and the pop-up windows show nothing at least for Internet Explorer. there was no change of website name or any other configuration change. The first thing I did was to take a look at the log file at

# less /var/log/httpd/error_log

*Click F so that you can see the log in real time

You will see an error

[client 192.168.1.2] PHP Fatal error: Allowed memory size of 16777216 bytes exhausted.....

To solve the issue,

# vim /etc/php.ini

memory_limit = 32M

Restart httpd

# service httpd restart