Hi lpvmc,
I probably can't solve your problem, but wanted to post a reply for you, with my best shot at it. Can you reproduce this problem? Was it a one-time event, or does it happen every time you do whatever it is that caused the error?
For me, it's not at all uncommon to get various kind of errors, and sometimes even crashes. And I have had runtime errors. Developers and more experienced users say Inkscape is stable, so I think I have so much trouble, maybe because I don't do things in the usual way, as I'm learning the program.
If it was a one time thing, don't worry about it. If you can reproduce it, then try searching
Launchpad to see if the problem has been reported already. (Launchpad is the place to "contact the application's support team for further information.")
By the way, what version of Inkscape are you using? If you're using the development version (0.47), and you can reproduce the problem every time, and you can't find evidence that it's been reported at Launchpad, then you could go ahead and make a new bug report. Be sure and include your OS, Inkscape version, the exact steps that produce the error, and sample .svg file illustrating the problem.
Also, if you can reproduce the problem, you might post here exactly the steps you are taking that cause the error. Maybe there is another way to do what you want.
I know this isn't much help, and maybe a more experienced member will come along with a mroe definitive answer. But please let me know what you find out, in any case.
All best