#28 Error if Exit from FFEditor and save the changes

[Orkin]

1. Create NewCourse
2. Add the Theory
3. Add the Examination
4. Delete the Examination
5. Close FF Editor
6. Define the Name and Click OK

Error occurred:
Value cannot be null.
Parameter name: path

at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize) at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding) at FireFly.CourseEditor.GUI.HtmlEditor.FFHtmlWriter..ctor(ItemType item) at FireFly.CourseEditor.GUI.HtmlEditor.HtmlPage.Store() at FireFly.CourseEditor.GUI.HtmlEditor.HtmlPageBase.StorePages() at FireFly.CourseEditor.Course.Course.Save() at FireFly.CourseEditor.Course.Course.SaveToZipPackage(String fileName) at FireFly.CourseEditor.GUI.MainForm.SaveCourse(Boolean saveNew) at FireFly.CourseEditor.GUI.MainForm.Course_Closing(CancelEventArgs e) at FireFly.CourseEditor.Course.Course.CanClose() at FireFly.CourseEditor.Course.Course.Close() at FireFly.CourseEditor.GUI.MainForm.OnFormClosing(FormClosingEventArgs e) at System.Windows.Forms.Form.WmClose(Message& m) at System.Windows.Forms.Form.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)