The Modulus mismatch error occurs when a Private key generated along with the CSR code does not match the certificate issued by the Certificate Authority.
There are several possible reasons for this to happen:
Make sure that the RSA key and certificate match in this matcher.
If they do match, retry the installation inputting all the values manually. If they do not match, please generate a new pair of CSR/RSA keys on your server, reissue the certificate and retry installation afterwards.