Cannot claim interest for cps in BM 3.1.3 or send cps to another alias - Witness signature not found - code 16

[testingsys]

I have a pending cps - claim interest and transfer to coinpayments issue. I have discussed it earlier with locutus and jag, but I put it on hold before I could try to claim interest from blockmarket. Today i have uninstalled BM and QT, deleted all files from the appdata folder(except wallet,mnconf and sysconf), installed bm3.1.3 and right now I am reindexing BM. I have tried reindex several times before, but this is the first time I am doing it after cleanup and reinstall. The issue is - I keep getting this error whenever I claim interest or try to transfer CPS to coinpaments. The alias is chanakya15. I had used this alias as a witness for all my other aliases and it worked fine. And I was able to claim interest on chanakya15 in qt, once earlier with hit and trial with several aliases.This was before 3.1.3. Thanks in advance. Here is the error

5000 cps bounty for any dev who can help me fix this before the next interest cycle. Interest has been claimed once through qt before 3.3. Another interest claim is pending.