I have been trying to book a flight from Detroit (DTW) to Barcelona Spain (BCN) using NWA.com and no matter what I select, I get the following message:

We're sorry, there was a problem processing this search request.

I have changed seating options (I was looking at booking Business or First) and even times or dates (in case the routing was illegal with too little transit time at AMS). I have even tried the search on different browsers and different computers. Has anyone seen this issue with their searches and is it a website glitch or possibly operator error (me, which is always possible )?