nat2020

Same problem here. Page crashed with the log:

Got error ‘PHP message: PHP Fatal error: Cannot redeclare formatType() (previously declared in …/wp-content/plugins/affiliates-manager/html/affiliate_creative_detail.php:4) in …/wp-content/plugins/affiliates-manager/html/affiliate_creative_detail.php on line 4\n’, referer: http://mysite/affiliate-home/?sub=creatives

I fixed it by wrapping the formatType with the if(..) {..} in
wp-content/plugins/affiliates-manager/html/affiliate_creative_detail.php

if (!function_exists('formatType')) {
function formatType($type)
{
        switch ($type)
        {
                case 'image': return __( 'Image', 'affiliates-manager' );
                case 'text': return __( 'Text Link', 'affiliates-manager' );
                default: wp_die( __( 'unknown creative type.', 'affiliates-manager' ) );
        }
}
}