Installation errors

Warning: include_once(/home/valmal/pvda.org/wordpress/wp-content/plugins/phpgrid/lib/inc/jqgrid_dist.php) [function.include-once]: failed to open stream: No such file or directory in /home/valmal/pvda.org/wordpress/wp-content/plugins/phpgrid/phpgrid.php on line 12
Hello,
I tried installing phpgrid and got the following errors. The last one seems to reference another pluginn that I have installed called “sugmug embed”. But, I thought you might want to see the error messages.

Warning: include_once() [function.include]: Failed opening ‘/home/valmal/pvda.org/wordpress/wp-content/plugins/phpgrid/lib/inc/jqgrid_dist.php’ for inclusion (include_path=’.:/usr/local/lib/php:/usr/local/php5/lib/pear’) in /home/valmal/pvda.org/wordpress/wp-content/plugins/phpgrid/phpgrid.php on line 12

Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at /home/valmal/pvda.org/wordpress/wp-content/plugins/phpgrid/phpgrid.php:12) in /home/valmal/pvda.org/wordpress/wp-content/plugins/smugmug-embed/SmugMugEmbed.php on line 35

http://wordpress.org/plugins/phpgrid/