tally 7.2

I am using tally 7.2

I have changed the company period on 1.4.07.Previous ly it was 1.4.06 now it has been changed to 1.4.07.

But after that changing the company is not opening in tally.It is showing error message that pls rewrite the company date.

Pls help me how to morectify this unless the company is not opening how could i modify the changes.

Pls reply to my email ID = sksindia123@rediffmail.com

Thanks