I have a problem about "ReportDocument" pass out to another dll

The error as following :


"System.InvalidOperationException: It is invalid to show a modal dialog or form when the application is not running in UserInteractive mode. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application.

Server stack trace:
   at System.Windows.Forms.MessageBox.ShowCore(IWin32Win dow owner, String text, String caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options)
   at System.Windows.Forms.MessageBox.Show(IWin32Window owner, String text, String caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options)
   at Microsoft.VisualBasic.Interaction.MsgBox(Object Prompt, MsgBoxStyle Buttons, Object Title)
   at PDFDComNS.PDFDCom.TestExport2PDF(ReportDocument rpt, String strOutPut)
   at System.Runtime.Remoting.Messaging.StackBuilderSink .PrivateProcessMessage(MethodBase mb, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink .SyncProcessMessage(IMessage msg, Int32 methodPtr, Boolean fExecuteInContext)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleRe turnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateI nvoke(MessageData& msgData, Int32 type)
   at PDFDComNS.PDFDCom.TestExport2PDF(ReportDocument rpt, String strOutPut)
   at ClientProgram.Main.cmdPDFDCom_Click(Object sender, EventArgs e) in C:\vbNetTesting\Client Testing\ClientProgram\Main.vb:line 400" String

Without details on what you're trying to do with it, I'd guess that the report has a parameter that is not being set, and is trying to show you a dialog to get the parameter, but is unable to because the application is WinForms or is a Service. Just a guess.