[Android 4] ProgressDialog inside Thread error while setMessage()

Hi guys,

I'm kind of lost over here.
The error doesn't happen all the time but it occurs more then wanted.
I'm fetching data from a webservice and while that occurs I've created a simple ProgressDialog saying the program is busy.
Problem is, when updating the ProgressDialog with setMessage() the whole application crashes. it does looks like the ProgressDialog text can not be updated inside a loop. And I was really looking for message update while fetching the results.

Any idea how should I do this thing?
Been using this example