perhaps I'm misunderstanding what your doing ?

If you want to set up your mms and having problems (I'm guessing you have an ATT phone?) on my w580i the settings for it were in the message area under "settings" made the profile name ATT MMS Setting and message server http://mmsc.cingular.com and the internet profile semc WAP

its as simple as that are you trying to do something more complicated?

and I THINK that the error you are getting is just a simple error saying your custom pack didn't go thru (which setool told you.)