nginx ssl certificate issue key values mismatch

I am have been trying to setup an ssl certificate for a few days now, I am buying it from Namecheap.com and I am buying a rapid ssl wildcard certificate I am doing the following:

1. Generate a csr - openssl req -newkey rsa:2048 -nodes -keyout server.key -out server.csr
2. I then wait to recieve an email to download the .crt file
3. Get the intermediate certificate and save it intermediatecert.crt
4. I then cat intermediatecert.crt >> sslcertificate.crt

5. I then add the following lines to my nginx virtual host file

   ssl_certificate /etc/ssl/sslcertificate.crt;
   
   ssl_certificate_key /etc/ssl/server.key;
   

6. I then restart my server and get the following error

   [emerg]: SSL_CTX_use_PrivateKey_file("/etc/ssl/server.key") failed (SSL: error:0B080074:x509 certificate routines:X509_check_private_key:key values mismatch)
   

Does anyone have any ideas ?

FIXED

I fixed this by not reissuing it via namecheap and went straight to rapidssl to reissue and upload my csr.

As noted in the question, Namecheap must have an issue with the "Reissue" feature available in the dashboard. To reissue the cert directly from RapidSSL, visit this page and enter your info: https://products.geotrust.com/orders/orderinformation/authentication.do

I had the same issue after I accidentally deleted my key file and csr for the original request, and this cleared it right up!