Digital signature - crl validation status false, please help

I am trying to use my Digital Signature on DGFT website for submitting my modified application.

I am getting this error on the process status tab (screenshot enclosed).

Rest all being 'true', CRL Validation is showing 'false'.

Please help, what is the problem, and what shall I do?

My Digital Signature is valid till April 2019.

Thanks in advance.