problem in asp.net

Question

hi i am beginner in asp.net.we are creating webmail in asp.net during registration i faced this problem please help error is:- System.IO.DirectoryNotFoundException: The system cannot find the path specified. (Exception from HRESULT: 0x80070003) at P3ADMINLib.P3DomainsClass.get_Item(Object vIndex) at register.AddPop3User(String MachineName, String DomainName, String UserName, String Password) in c:\inetpub\wwwroot\mail.veoda.com\mail\register.aspx.cs:line 118 at register.ImageButton1_Click(Object sender, ImageClickEventArgs e) in c:\inetpub\wwwroot\mail.veoda.com\mail\register.aspx.cs:line 167