How to file return for a y 2014-15 after 31.03.2016

Respected Professionals,

Received notice for non filing of ITR for A Y 2014-15 now on 10.05.2016.The assessee is a PSU employee and has taxable Income in A Y  2014-15. Tax already deducted at source by employer.However,ROI could not be filed due to some ignorance.

Now,since the due date has already crossed for belated Returns, E filing site is not accepting the Return for A Y 14-15.In such a case what should be the approach as we have received notice from ITD for non filing ROI.

Please help in this regard.