Mail app crashes upon launch!!

hi everyone,
have macbook pro 13" mid 2010.
running osx lion 10.7.3.
when launch mail app crashes within 5 seconds.
no windows open, icon bounces 5-6 times , crashes.
please me!
give me crash report:


process: mail [6236]
path: /applications/mail.app/contents/macos/mail
identifier: com.apple.mail
version: 5.2 (1257)
build info: mail-1257000000000000~1
code type: x86-64 (native)
parent process: launchd [252]

date/time: 2012-03-26 18:44:59.418 +0700
os version: mac os x 10.7.3 (11d50b)
report version: 9

interval since last report: 111022 sec
crashes since last report: 17
per-app crashes since last report: 6
anonymous uuid: 5cebb076-2b43-4837-ad04-65521f7afe2a

crashed thread: 0

exception type: exc_breakpoint (sigtrap)
exception codes: 0x0000000000000002, 0x0000000000000000

application specific information:
dyld: launch, loading dependent libraries

dyld error message:
symbol not found: _objc_class_$_nsobject
referenced from: /system/library/privateframeworks/ilifemediabrowser.framework/versions/a/ilifemediabrowser
expected in: /usr/lib/libobjc.a.dylib
in /system/library/privateframeworks/ilifemediabrowser.framework/versions/a/ilifemediabrowser

please help!

 

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