Filing for gstr-3b for month of october 2017

Respected CCI Members,

Kindly Help me for below Issue.

One of my client was in composite scheme till 13th November 2017.I have filed GSTR-4 and Paid Tax under Composite Scheme for the quarter July to September. Now I would like to file GSTR-3B for the month of October 2017[That is as regular dealer].But system does not allow me file the return and it prompts  " GSTR-3B Not Filed For Previous Periods". 

Kinldy me help me to resolve this issue,

Thanks in Advance.

Yours Faithfully,

Dhebek.M.N