Why was Maharashtra Congress MLA KC Padavi made to take oath again?

Seven-time Congress MLA KC Padavi was halted midway into his oath as Maharashtra Cabinet minister by Governor Bhagat Singh Koshyari on Monday. Towards the end of his oath, Padavi went on to speak a few lines beyond the text of the oath provided to him. The Governor refused to accept the swearing-in and asked Padavi to take the oath again.