5th ODI: Did Umpire error lead to a tie?

The 5th ODI at Adelaide between India and Srilanka ended in a tie. Reports suggests that the 30th over in the Indian innings was a 5 ball over and the umpire didn't notice it.

Speaking to the media Dhoni said "Yes it was a 5 ball over but nothing can be done now."

India needed 4 runs of the last ball in the innings.

Chasing 237, set by the Lankans, India lost wickets at regular intervals.

However, brilliant knocks from Gautam Gambhir (91) and Dhoni 58 took India to 236.