I am facing the same problem too. My DNN is 04.05.03 and Forum Module 04.04.03.
Here is the error message:
ModuleId: 382
ModuleDefId: 106
FriendlyName: Delete Post
ModuleControlSource: DesktopModules/Forum/Forum_PostDelete.ascx
AssemblyVersion: 04.05.03
PortalID: 0
PortalName: Sunrise Berhad
UserID: 5
UserName: SUNRISEHQ\cfthong
ActiveTabID: 56
ActiveTabName: Forums
RawURL: /staffportal/Forums/tabid/56/ctl/PostDelete/mid/382/forumid/16/postid/133/Default.aspx
AbsoluteURL: /StaffPortal/Default.aspx
AbsoluteURLReferrer: http://sunriseweb2/staffportal/Forums/tabid/56/ctl/PostDelete/mid/382/forumid/16/postid/133/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 499d3422-ce50-446d-b7d5-c4a340688909
InnerException: The parameter 'to' cannot be an empty string. Parameter name: to
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Net.Mail.MailMessage..ctor
StackTrace:
Message: DotNetNuke.Services.Exceptions.ModuleLoadException: The parameter 'to' cannot be an empty string. Parameter name: to ---> System.ArgumentException: The parameter 'to' cannot be an empty string. Parameter name: toat System.Net.Mail.MailMessage..ctor(String from, String to)at DotNetNuke.Services.Mail.Mail.SendMail(String MailFrom, String MailTo, String Cc, String Bcc, MailPriority Priority, String Subject, MailFormat BodyFormat, Encoding BodyEncoding, String Body, String Attachment, String SMTPServer, String SMTPAuthentication, String SMTPUsername, String SMTPPassword, Boolean SMTPEnableSSL)at DotNetNuke.Services.Mail.Mail.SendMail(String MailFrom, String MailTo, String Cc, String Bcc, MailPriority Priority, String Subject, MailFormat BodyFormat, Encoding BodyEncoding, String Body, String Attachment, String SMTPServer, String SMTPAuthentication, String SMTPUsername, String SMTPPassword)at DotNetNuke.Services.Mail.Mail.SendMail(String MailFrom, String MailTo, String Bcc, String Subject, String Body, String Attachment, String BodyType, String SMTPServer, String SMTPAuthentication, String SMTPUsername, String SMTPPassword)at DotNetNuke.Modules.Forum.Utils.SendForumMail(Int32 ContentID, String URL, ForumEmailType EmailType, String Notes, Config ForumConfig, String ProfileURL, Int32 PortalID)at DotNetNuke.Modules.Forum.PostDelete.cmdDelete_Click(Object sender, EventArgs e)--- End of inner exception stack trace ---
Source:
Server Name: SUNRISEWEB2