problem on CENTOS server

Hello,
I have try to install the OpenSim Currency Server into CentOS 5.3.
And i receive this error then I have execute :


Connecting to DB... [19]
[MYSQL]: Connection established
[BASE HTTP SERVER]: Error - certificate
Parameter name: 'certificate' cannot be null.
[BASE HTTP SERVER]: Tip: Do you have permission to listen on port 8008, 0?

Unhandled Exception: System.ArgumentNullException: certificate
Parameter name: 'certificate' cannot be null.
at HttpServer.Check.Require (System.Object value, System.String parameterOrErrorMessage) [0x00000] in <filename unknown>:0
at HttpServer.HttpListenerBase..ctor (System.Net.IPAddress address, Int32 port, IHttpContextFactory factory, System.Security.Cryptography.X509Certificates.X509Certificate certificate) [0x00000] in <filename unknown>:0
at HttpServer.HttpListener..ctor (System.Net.IPAddress address, Int32 port, IHttpContextFactory factory, System.Security.Cryptography.X509Certificates.X509Certificate certificate) [0x00000] in <filename unknown>:0
at HttpServer.HttpListener.Create (System.Net.IPAddress address, Int32 port, System.Security.Cryptography.X509Certificates.X509Certificate certificate) [0x00000] in <filename unknown>:0
at OpenSim.Framework.Servers.HttpServer.BaseHttpServer.StartHTTP () [0x00000] in <filename unknown>:0

Can you help me?
Best regards