Error message when activated

I’ve tried to activate the easy affiliates plug in several times. I’m getting the message below every time. Please help on how I can get this activated in my site. http://www.travelpumps.com

Thank you!

Notice: Use of undefined constant updateLinks – assumed ‘updateLinks’ in /home8/travenf3/public_html/wp-content/plugins/easy-affiliate/wordpressPlugin.php on line 104

Notice: Use of undefined constant custom_dashboard_help – assumed ‘custom_dashboard_help’ in /home8/travenf3/public_html/wp-content/plugins/easy-affiliate/wordpressPlugin.php on line 110

Notice: Undefined variable: plugin_version in /home8/travenf3/public_html/wp-content/plugins/easy-affiliate/wordpressPlugin.php on line 36
WordPress database error: [Multiple primary key defined]
ALTER TABLE paltip_links ADD PRIMARY KEY (id)

Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at /home8/travenf3/public_html/wp-content/plugins/easy-affiliate/wordpressPlugin.php:104) in /home8/travenf3/public_html/wp-content/plugins/contact-form-plugin/contact_form.php on line 885

Notice: Undefined variable: plugin_version in /home8/travenf3/public_html/wp-content/plugins/easy-affiliate/wordpressPlugin.php on line 36
WordPress database error: [Multiple primary key defined]
ALTER TABLE paltip_links ADD PRIMARY KEY (id)

http://wordpress.org/extend/plugins/easy-affiliate/