i just went through this problem on my bravo so i want to share the solution.
actually i searched the XDA but didnt get the solution.
"think again before going to hard reset or clear cache, there might be some easy ways to get rid of it
i got this message whenever i receive a phone call.
This error message is a common complaint among Sprint users, but it can easily be removed by taking the following steps:
1. From the Home screen, hit the Menu key.
2. Tap on Settings.
3. Select Call settings.
5. Select Reject with message.
6. Count how many messages are in this section.
7. Delete them until you have less than five.
After reducing the number of messages to fewer than five, you should be able to receive calls without an error message compelling you to force close the call.
Something I've also had to do to get the phone working again was going into the 'manage applications' screen and clearing the data for the phone application. This can be accomplished as follows:
From the home screen, press Menu
Tap Manage Applications
At the top, tap the All tab
Navigate to and tap your equivalent of the phone app (may be called Phone or Dialer)
Tap Clear Cache and Clear Data as available
Turn your phone off, then back on.
Another means of resolving those app errors, hope this helps!
didnt work above methods? strange!! hmm
1.go into recovery
2. go to wipe/format option
3. clear cache
4. hard reset( not necessary,try only clear cache if works)