I need help in resolving a PHP error

I am getting this error when debugging wordpress.

Undefined index: api_pass in /home2/csemscou/public_html/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/authorizenet-aim.php on line 57 Notice: Undefined index: api_sig in /home2/csemscou/public_html/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/authorizenet-aim.php on line 58 Notice: Undefined index: currency in /home2/csemscou/public_html/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/authorizenet-aim.php on line 59 Notice: Undefined index: locale in /home2/csemscou/public_html/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/authorizenet-aim.php on line 60