OSERROR

[ghost]

what am i missing?
Traceback (most recent call last):
File "safari_downloader.py", line 70, in
downloader.download()
File "safari_downloader.py", line 48, in download
os.makedirs(save_folder, exist_ok=True)
File "C:\Users\Tsahi Elkayam\AppData\Local\Programs\Python\Python37-32\lib\os.py", line 221, in makedirs
mkdir(name, mode)
OSError: [WinError 123] The filename, directory name, or volume label syntax is incorrect: 'D:\/Lesson 01: Test-Drives: Using IPython and Jupyter Notebooks'