ITR RETURN FILING FOR 31-03-2018.

My Assessee is not able to file return for his deceased wife for 31-03-2018.Because his wife deceased on 01-04-2012.My Assessee filed her wife's Return for the past five years in the capacity as representative Assessee but now it is not able to upload the return as representative Assessee it is said after one of year of death not able file message said in income tax return filing website.How to file for 31-03-2018 return . Kindly Clarify.