Chaudhary Charan Singh University [CCSU] — unable to fill my 4th semester back form due to technical error on the university exam portal.

Address: Chaudhary Charan Singh University, Meerut, Uttar Pradesh 250001

Sir, i am a student of b. C. A, my roll no. Is[protected] and i have a semester back in 4th sem. I am unable to fill my 4th sem back form online due to a technical error on the website that you cannot fill the form because the form is already filled poolkey ref. No. 1635228.
Sir, please fix my issue asap as i have to fill my form and submit it to my college. I am attaching the exam website error showing with the complaint.
Name:- sourav
Roll no.:[protected]
Enroll no.:[protected]
College code:- 919