error undefined when uploading images v.1.5.6.0

[Raguis]

Hello,

 

I'm having some problems when unploading product images, it says "undefined" error.

 

I've been reviewing old posts from this forum about the same problem, but I couldn't find a solution.

 

I'm using 1.5.6.0 version, and it was working perfectly fine, but then, without any apparent reason it stopped working. I haven't modified or updated anything, the only thing I did yesterday was delete the default products (ipods, etc).

 

Is there anyone with the same problem? Any ideas of how can I fix it?

 

I was thinking to update prestashop to 1.6 versions, but the template I'm using is not compatible

 

thanks, any help would be greatly appreciated!