My viewer disconnects when I try to import rigged mesh

[PetiitePerl]

Hello, I am trying to import a rigged mesh dress created by me in second life, but when I click on the (import weighing skin) flap my viewer disconnects "SL viewer" what could be the problem?Please I need help, my computer is brand new (less than a week) lol and  I bought good items for the sl not work well now 

I use windows 8.

[Lindal Kidd]

Are you qualified to upload mesh?  You must have payment info on file, and take a short quiz on intellectual property issues.

[PetiitePerl]

yes i have all ok

[PetiitePerl]

I already imported several items at sl mesh, but this rigged and is not working

[Innula Zenovka]

What viewer are you using?   I don't know much about mesh but certainly some of my mesh-maker friends say they will always use the latest official LL viewer to upload mesh, whatever viewer they use for other things.

Also, is it any rigged  mesh that crashes your viewer or just  this particular one?