How to solve the errors:
- GUI.java > Design > Navigator > JFrame > panelMain > Set Layout > Absolute Layout
- You need to have jCalendar-1.4.jar in your library(you can google how install this)
- After installing it you need to drag jDateChooser into "panelAddBooking" and change the variable name to "bookingDate".
- You can change your package name if you want.
- You're done!