Amazon plug-in error

I installed Amazon plug-in but whenever I go to set it up, I get the following message

Fatal error: Cannot redeclare class wp_amazon in F:\Domains\lolafayemi.com\wwwroot\wp-content\plugins\wp-amazon\wp-amazon.php on line 30

What does this mean? What can I do? I’m no hardcord coder but have common sense so could someone tell me what to do without assuming too much please?

Thanks

Lola
http://www.lolafayemi.com