when I set moderator for 1 user, I got an error:

System.Data.SqlClient.SqlException: INSERT statement conflicted with COLUMN FOREIGN KEY constraint 'FK_Forum_Moderators_Forum_Forums'. The conflict occurred in database 'sauthongquan', table 'Forum_Forums', column 'ForumID'. The statement has been terminated. at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteNonQuery(SqlConnection connection, CommandType commandType, String commandText, SqlParameter[] commandParameters) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteNonQuery(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteNonQuery(String connectionString, String spName, Object[] parameterValues) at DotNetNuke.Modules.Forum.SqlDataProvider.ModeratorAdd(Int32 ForumID, Int32 UserID) at DotNetNuke.Modules.Forum.UserSettings.UpdateModeratedForums() at DotNetNuke.Modules.Forum.UserSettings.cmdUpdate_Click(Object sender, EventArgs e)

I used newest DNN 3 and newest forum version.

Thanks

But I checked and found this user is not a moderator of that forum. I tried setting for another user and got similar error.

I don't know why ?