My products desappears when you buy it [SOLVED]

[ivars91]

 This morning, I have received an order from a customer. I received the money and the order have been a success.  He buys two products, but when I was going to check, the product was disappeared in my onlinestore :S with a message like this:

 

Oops, something went wrong. Try to refresh this page or feel free to contact us if the problem persists.

 

The products that I am talking:

 

http://www.latiendadelapicultor.com/comprar-colmenas-dadant/colmena-dadant-trashumancia.html

y

http://www.latiendadelapicultor.com/ropa-proteccion-apicultor/bluson-con-careta.html

 

I don't know what can I do.... First I thought that it was a momentary problem, but it keeps existing during all the day. 

 

I have 1.5.6.0 version. www.latiendadelapicultor.com is my online store, and the trouble only appears in the two products what were purchased.

 

Thanks so much.

 

Edit: I have enabled the report errors mode and this is the error:

 

 

SOLVED: The problem was in the CROSS SELLING MODULE

Edited October 27, 2013 by ivars91 (see edit history)