JSON Parse error: Unrecognized token '<' OK

Hi,

I've been working on OpenCart for a couple of months now, and I'm about to release our webshop.

But I'm facing a problem when I'm trying to create an order on OpenCart...

This is the error that shows up:

SyntaxError: JSON Parse error: Unrecognized token '<'
OK
<b>Notice</b>: Undefined variable: json in <b>/var/www/0/98038/www/admin/controller/sale/order.php</b> on line <b>2490</b>

Have anyone faced the same problem before? And what was the solution?

Kjetil

This is a very common error that has been dealt with many times in the forum. Had you tried this article?
http://forum.opencart.com/viewtopic.php?f=133&t=45863