Sdlxlif Conversion error

My name is Manuel Caballero and I have a problem at using the “SDLXLIFF Legacy Converter”.

 

First of all, I have Trados 2014 on my PC right now, but I have tried to do the same with Trados 2011 and I get the same result, the following error message:

 

 

This is the error message that appears when I try to convert the SDLXLIFF files into TTX.

 

Please, could you help me to solve the problem?? Or cannot I convert these files for any specific reason?