Sorry to resurrect an old thread, I get the above message too. The only option is one button, "Force Close".
I upgraded my Samsung Galaxy 3 5800I from Eclair 2.1 to Froyo 2.2. It is not a supported upgrade, I just pulled some stuff off the net. I really like some aspects of the new interface.
Samsung NZ has not yet seen fit to offer the official upgrade, even though in other countries it is an upgrade option available and is managed through the Kies software.
So I guess I am paying for my impatience! On trying the clear data option I notice two things
1 There is not in fact an app installed called com.android.mms. Instead, there is a process called "Messaging version 2.2".
2 It records a total of 0KB of data after I have cleared messages so unlike previous posts it is clearing data OK.
After clearing data, I tried to send a test message. Some sort of message in a box popped up on screen but closed very quickly so I've no idea what it said.
So, in a nutshell, I cannot receive mms messages, although AFAIK messages I write are going out OK but can't be sure.
I'm hoping that over the past few months since the last post in this thread, someone has encountered a fix for this? Otherwise it might have to be the old "Factory reset" which presumably would put me back to 2.1, something I am reluctant to do. But ability to text is not negotiable!
DW