If you have not applied for exams so far, then your roll number will not be displayed. Moreover there are three boxes appear to fill membership number. Select ST or T in first box, Type number 524674 (in your case) in second box and 7 in third box (in your case).
Generally roll numbers are issued about 10 to 15 days before start of exams on http://www.ieindia.org/ and a link is also given at http://www.amiestudycircle.com/
If you check your roll number before that then error will occur.