HI - I'm getting the error in the subject when I try and send out a newsletter. It all worked fine until I reached 1000 subscribers or so and then I started getting this error. I wonder if something is timing out? And if so what? And how do I work around it? Any help appreciated.

Full error details are:

Error: Newsletters is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Modules.Admin.Users.BulkEmail.cmdSend_Click(Object sender, EventArgs e) --- End of inner exception stack trace ---

ModuleId: 357
ModuleDefId: 28
FriendlyName: Newsletters
ModuleControlSource: Admin/Users/BulkEmail.ascx
AssemblyVersion: 04.00.02
Method: DotNetNuke.Modules.Admin.Users.BulkEmail.cmdSend_Click
FileName:
FileLineNumber: 0
FileColumnNumber: 0
PortalID: 0
PortalName: Buffett Cup
UserID: 1
UserName: host
ActiveTabID: 45
ActiveTabName: Newsletters
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.buffettcup.com/Admin/BulkEmail/tabid/45/Default.aspx
ExceptionGUID: a37dc993-dbc6-451e-b72f-63e0478f11a7
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
InnerException: Object reference not set to an instance of an object.
Message: DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Modules.Admin.Users.BulkEmail.cmdSend_Click(Object sender, EventArgs e) --- End of inner exception stack trace ---
StackTrace:
Source:
Server Name: SERVER3

Any chance someone could help me debug this to find out what is going wrong?

Thanks,