HA! this same thing happened to me a couple days ago when i was trying to get an ad hoc network setup on the mogul to allow the ipod touch to use it for internet access.

i kept fooling around and fooling around and a day or so later i got this error you have. popup after popup! it was insane! i then did the iota and it could not connect to vision since i was having issues dialing #777, so then i ended up having the popup about the 67 error and a 1012 error about data provisioning. i went up to the top of the tech tree at sprint
and the only thing they could do was remove the data package off the account and reapply to see if that would work. i told him no and to have a good day and hung up.

basically you are going to have to do a hard reset. thats what i did last night (used clear storage) and am reinstalling as we speak. i needed to anyway because i like to spring clean this thing every few months. im now afraid to re try the ipod touch adhoc setting for fear this will happen again.

but yeah it was insane... i could barely use the phone due to the popups poping up every few seconds! it was insane!!!