You need to have a copy of certsage.php in the webroot directory for prajapatipariwar.bioinformaticsonline.com in order to acquire a certificate for it. You will want to ensure that your CertSage data directory (as indicated on line 19 of certsage.php in version 3.0.2) is not accessible from the public internet. Feel free to change that line to point to a directory a safe location.
As a side note, you really should upgrade your CertSage:
Not sure why you would get an error with v3.0.2. Unless there's a PHP-version-related error, that makes no sense. Glad you were able to get a cert though.
You'll need to acquire and install another cert the same way before the current one expires.