SmarterMail 5.x

[preluderd]

I am getting an error when trying to send a message that says "Unable to send message at this time." the following is the error from the SmarterMail logs.

Anyone have an idea for a fix? No mail can be sent right now.

[CurrentUser: user@domain.com]
[9/1/2008 11:27:54 PM]

System.Runtime.Serialization.SerializationException: Type 'SmarterTools.SmarterMail.GroupFileAccess.GroupFileCorruptException' in Assembly 'MailStore, Version=5.5.3159.28392, Culture=neutral, PublicKeyToken=null' is not marked as serializable.

Server stack trace:
at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter)
at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck)
at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck)
at System.Runtime.Remoting.Channels.BinaryServerFormatterSink.SerializeResponse(IServerResponseChannelSinkStack sinkStack, IMessage msg, ITransportHeaders& headers, Stream& stream)
at System.Runtime.Remoting.Channels.BinaryServerFormatterSink.ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, IMessage& responseMsg, ITransportHeaders& responseHeaders, Stream& responseStream)

Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at SmarterTools.SmarterMail.Remoting.IMail.SendMessage(String sessionStr, String emailAddress, String[] recipientsArr, String messageText)
at SmarterTools.SmarterMail.Remoting.RemoteMail.SendMessage(String sessionStr, String email, String[] recipientsArr, String messageText)
at SMWeb05.HelperClasses.RemoteWrapper.SendMessage(UserData userData, String fromAddress, String[] recipients, String messageText)
at SMWeb05.Main.frmComposeInner.SendImagebutton_Click(Object sender, EventArgs e)