AUTO BUG REPORT: Argument nr 2 is not of the correct type. Expected one of : int, slice.

[CALOAReportSender]

Windows-7-6.1.7601-SP1
CPython-3.6.5
Traceback (most recent call last):
  File "C:\Users\pixel\AppData\Local\Programs\Python\Python36\lib\tkinter\__init__.py", line 1702, in __call__
    return self.func(*args)
  File "application.py", line 325, in <lambda>
    command=lambda: self.saveSpectra("Basic", "White")
  File "application.py", line 513, in saveSpectra
    pick.dump(self.spectra_storage[folder_id, subfolder_id, :])
  File "C:\Program Files (x86)\CALOA\spectro.py", line 1135, in __getitem__
    + " Expected one of : int, slice.")
ValueError: Argument nr 2 is not of the correct type. Expected one of : int, slice.