Your gross total income (before allowing any deductions under section 80C to 80U) exceeds Rs. 2.5 lakhs in the FY 2017-18. so you have to file return.But you no need to pay tax.
your net income is less than 2.5 lacs so no need to pay income tax but you will have to file income tax return since your gross total income is above 2.5 lacs