I am getting an error while filing GSTR 3B for the month of August 2017. When i try to save the data i get an eror saying "HEADER VALUE MISSING". Kindly guide, what this is and how to resolve?

I am getting an error while filing GSTR 3B for the month of August 2017. When i try to save the data i get an eror saying "HEADER VALUE MISSING". Kindly guide, what this is and how to resolve?
