kontact crashes while accessing calendar

Hi, 

I am using kontact 1.2.9 on FC9. 

I am facing a problem while accessing calendar / to-Do. The application 
crashes with following message. 
--------------------------------------------------------------------------------------
DCOP aborting (delayed) call from 'anonymous-3835' to 'korgac'
KCrash: Application 'korgac' crashing...
Could not find 'drkonqi' executable.
KCrash cannot reach kdeinit, launching directly.
*** KMail got signal 11 (Crashing)
KCrash: Application 'kontact' crashing...
Could not find 'drkonqi' executable.
KCrash cannot reach kdeinit, launching directly.
X Error: BadWindow (invalid Window parameter) 3
  Major opcode:  7
  Minor opcode:  0
  Resource id:  0x6e0024d
ICE default IO error handler doing an exit(), pid = 3820, errno = 11
-----------------------------------------------------------------------------------------

I am able to access kmail and addressbook but calendar and To-Do applications 
are not accessible. Can somebody help me ? Do I need to reinstall Kontact ?

Shrikant