Volta a fazer o download da rom e volta a instalar o problema deve ser este -> http://forums.miuiandroid.com/showthread.php?13353-2-2-3-Dialer-bug
P.S. Devias escrever en inglês.
I was getting repeated force closes caused by an IO error and found out that the problem was caused by the /datadata partition getting out of space.
To work around it I've copied the /datadata contents to /data/data2, removed the symlink /data/data and renamed /data/data2 to /data/data...