Starting from last week I am getting too many of the following error logged in event log every couple of seconds and I have had no success fixing it.I guess it might be something related to the language file!

Nothing has been changed (files and settings) in forum since last year!

Exception Thrown in SendMail Thread: System.ArgumentException: The specified string is not in the form required for a subject.

at System.Net.Mail.Message.set_Subject(String value)

at YAF.Core.MailMessageExtensions.Populate(MailMessage mailMessage, MailAddress fromAddress, MailAddress toAddress, String subject, String bodyText, String bodyHtml)

at YAF.Core.Services.YafSendMailThreaded.ConstructMessageList(IDictionary`2 mailMessages, IEnumerable`1 mailList)

at YAF.Core.Services.YafSendMailThreaded.SendThreaded

Any idea?

Regards