Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python27\lib\lib-tk\Tkinter.py", line 1532, in __call__
    return self.func(*args)
  File "D:\BACK UP SORTED\SC\MODDING\PyMS\PySPK.pyw", line 1102, in saveas
    self.save()
  File "D:\BACK UP SORTED\SC\MODDING\PyMS\PySPK.pyw", line 1088, in save
    self.spk.save_file(self.file)
  File "D:\BACK UP SORTED\SC\MODDING\PyMS\Libs\SPK.py", line 162, in save_file
    f.write(self.save_data())
  File "D:\BACK UP SORTED\SC\MODDING\PyMS\Libs\SPK.py", line 184, in save_data
    headers += struct.pack('<HHL', star.x, star.y, images[lookup])
error: ushort format requires 0 <= number <= USHRT_MAX