Errors with Simple Session Plugin

I am trying to enable PHP session data and was hoping this plugin would help. However, when I activate the plugin, I immediately get several error messages at the top of my site (see below). I am not an expert and have no idea what is going wrong.

Please help!

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Warning: session_start() [function.session-start]: open(/var/chroot/home/content/11/6401911/tmp/sess_jsvkl2kgu4elbukqrigjmsvng2, O_RDWR) failed: No such file or directory (2) in /home/content/11/6401911/html/wp-content/plugins/simple-session-support/simple-session-support.php on line 40

Warning: session_start() [function.session-start]: Cannot send session cookie – headers already sent by (output started at /home/content/11/6401911/html/wp-content/plugins/simple-session-support/simple-session-support.php:40) in /home/content/11/6401911/html/wp-content/plugins/simple-session-support/simple-session-support.php on line 40

Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at /home/content/11/6401911/html/wp-content/plugins/simple-session-support/simple-session-support.php:40) in /home/content/11/6401911/html/wp-content/plugins/simple-session-support/simple-session-support.php on line 40
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http://wordpress.org/extend/plugins/simple-session-support/