System.ArgumentException: Data Source cannot be empty. Use :memory: to open an in-memory database

During a Backup Error details System.ArgumentException: Data Source cannot be empty.  Use :memory: to open an in-memory database    at System.Data.SQLite.SQLiteConnection.Open()    at PortfolioManager.Core.Model.Portfolio.GetAllPortfolios(Boolean isBullSystem)    at WebLink.ChartsFramework.PortfolioWatchListFolder.OnExpandNode(TreeNode node)    at WebLink.ChartsFramework.SymbolManager.treeView_BeforeExpand(Object sender, TreeViewCancelEventArgs e)    at System.Windows.Forms.TreeView.OnBeforeExpand(TreeViewCancelEventArgs e)    at WebLink.Controls.WebLinkTreeView.OnBeforeExpand(TreeViewCancelEventArgs e)    at System.Windows.Forms.TreeView.TvnExpanding(NMTREEVIEW* nmtv)    at System.Windows.Forms.TreeView.WmNotify(Message& […]