Problem installing plugin

[elvovsky]

I am having a problem when click on install button in the "Plugin Management". It does not seem to do do anything. Looking at apache logs i see this

[Fri Mar 11 16:27:50 2011] [error] [client 10.40.15.32] PHP Warning: include_once(/usr/share/cacti/site/plugins/gpsmap/includes/database.php): failed to open stream: Permission denied in /usr/share/cacti/site/plugins/gpsmap/setup.php on line 38, referer: http://10.40.15.35/cacti/plugins.php
[Fri Mar 11 16:27:50 2011] [error] [client 10.40.15.32] PHP Warning: include_once(): Failed opening '/usr/share/cacti/site/plugins/gpsmap/includes/database.php' for inclusion (include_path='.') in /usr/share/cacti/site/plugins/gpsmap/setup.php on line 38, referer: http://10.40.15.35/cacti/plugins.php
[Fri Mar 11 16:27:50 2011] [error] [client 10.40.15.32] PHP Fatal error: Call to undefined function gpsmap_setup_database() in /usr/share/cacti/site/plugins/gpsmap/setup.php on line 40, referer: http://10.40.15.35/cacti/plugins.php

Can someone help? XML directory has read/write

[TheWitness]

You do not have permission to open the gps maps file. You need to run a chmod so that apache user can access.