When I try to execute the sp in SQL this is the error that I get. Does anyone know what the problem could be?

Msg 6522, Level 16, State 1, Procedure p_SendEMail, Line 0

A .NET Framework error occurred during execution of user-defined routine or aggregate "p_SendEMail":

System.NullReferenceException: Object reference not set to an instance of an object.

System.NullReferenceException:

at SQLCLREmail.SendEmail(String recipients, String CC, String BCC, String subject, String from, String body, String strAttachments, String strSMTPServer, String strSMTPServerPort, String strSMTPServerUser, String strSMTPServerPwd)

.