Exchange - Event ID 6 Exchange Certificate

Hi,

(There may be other posts with this Event ID but none that I can find match the error I am getting)

My exchange server's Certificate has expired, I went to add a new certificate to exchange by using powershell, and this error appeared in Event Viewer.

Cmdlet failed. Cmdlet Import-ExchangeCertificate, parameters {Server=ExchangeServer, FileData={Parameter value is too large.}}.

I don't have any idea what it is reffering to when it says "FileData={Parameter value is too large}}"

Also along with this error, I can't seem to complete the request when adding a new certificate to Exchange, It gives off a "Thumbprint already exists" error so It can't complete the request,

Any help on either of these issues would be greatly appreciated.