Difficulty in getting conso file

Sir,

In 4th Qtr FY 2013-14, since it was permitted to file a NIL Return, i have filed the same But now when im trying to get the conso file for correction of PAN nos, the message shows there was CHALLAN MISMATCH, and traces instructs to go for online correction. since it is ZERO Amount (NIL CHALLAN) i can not do any modification. can anybody come across this situation pls help me in this issue..Thanks