SAP Router Renewal Error

Dear SAP Expert Team,

Dear SAP Team,

I am renewal SAP Router certificate every year.

But when I am renewing  this year.Its give error messege.

When I Copy Certreq text  file in SAP Market place for Import Certificate . Its give below messege

ERROR -REQUEST CERTIFICATE FOR SAPROUTER

The CSR with whitch you have attempted to order acertificate contains a key with a length less tha 2048 Bit.

SAProuter certificates are issued by the new SAProuter CA.

Please see SAP Note 2131531 for details and the mandatory instructionImage may be NSFW.
Clik here to view.

Please  find the screen shoot and guide us , Where I am doing mistake .

Regards