gstr 3b filing error

I am trying to file gstr 3b October . I have submitted . I have ofseted liabilities and there is no liabilities . but when I try to file .
it is showing me an error "some error occurred please save gstr 3b form again ."
I tried with help.desk no use it has been two months . I'm.not able.to file other consequent months gstr 3b. does any one have solution for it