Hello Ketan! Thanks for posting!
I would like to assist you with getting your device working the way it should.
Have you ensured your device is running the latest software version? If not, please update the software first. If you still notice the force close errors after ensuring your software is up to date, then try resetting the applications that are giving the errors. Reset the phone/dialer application, contacts/people and messaging applications. As a last resort, a hard reset of the device will resolve the issue as well. Please ensure your data is backed up prior to the reset.
I trust I have answered your questions, and have addressed your concerns.
I've only ever gotten acore errors like that when I have a bad ROM flash. Try a factory reset, if that doesn't work you may have to get warranty support, as there's no stock way to re flash the stock ROM without voiding your warranty...