What does this mean and how do I fix it?

2011 07:04:11] PHP Warning: define() expects at least 2 parameters, 1 given in /path/websitename/folder/admin/includes/functions/extra_functions/ultimate_cross_sell.php on line 281

Where is the other parameter suppose to come from? or does this mean that line 281 is suppose to generate 2 parameters and it is only generating one.


1.3.9h new install with andover modern and upsell addon