Fail at scanning new roms

[Former user]

Hi! When I try to scan for new roms, this message appears when it starts.

"Version 7.4

System.NullReferenceException: Referencia a objeto no establecida como instancia de un objeto. en (ImportGamesFromFilesWizardForm , DataGridViewRow , Dictionary2 ) en Unbroken.LaunchBox.Desktop.Forms.ImportGamesFromFilesWizardForm.AddRomImportOperation(DataGridViewRow row, Dictionary2 multiDiscOperations) en (ImportGamesFromFilesWizardForm , Object , WizardPageConfirmEventArgs ) en Unbroken.LaunchBox.Desktop.Forms.ImportGamesFromFilesWizardForm.readyWizardPage_Commit(Object sender, WizardPageConfirmEventArgs e) en AeroWizard.WizardPage.OnCommit() en AeroWizard.WizardPageContainer.NextPage(WizardPage nextPage, Boolean skipCommit) en AeroWizard.WizardPageContainer.nextButton_Click(Object sender, EventArgs e) en System.Windows.Forms.Control.OnClick(EventArgs e) en System.Windows.Forms.Button.OnClick(EventArgs e) en System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) en System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) en System.Windows.Forms.Control.WndProc(Message& m) en System.Windows.Forms.ButtonBase.WndProc(Message& m) en System.Windows.Forms.Button.WndProc(Message& m) en System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)"