SyntaxError unicode error unicodeescape codec can t decode bytes in position 2-3 truncated UXXXXXXXX escape

Question

This is my code, i want python to make put all kinds of folders in the folder i made with the module os but it gives the error...

import os

main_folder = "C:\Users\marin\OneDrive\Documenten\jaar 2\Practicum 2\E shell"

if not os.path.exists(os.path.join(main_folder, "Bias")):

    os.mkdir(os.path.join(main_folder, "Bias"))

if not os.path.exists(os.path.join(main_folder, "Dark")):

    os.mkdir(os.path.join(main_folder, "Dark"))

if not os.path.exists(os.path.join(main_folder, "LED")):

    os.mkdir(os.path.join(main_folder, "LED"))

if not os.path.exists(os.path.join(main_folder, "Orders")):

    os.mkdir(os.path.join(main_folder, "Orders"))

if not os.path.exists(os.path.join(main_folder, "Thar")):

    os.mkdir(os.path.join(main_folder, "Thar"))

if not os.path.exists(os.path.join(main_folder, "Tungsten")):

    os.mkdir(os.path.join(main_folder, "Tungsten"))

if not os.path.exists(os.path.join(main_folder, "Calibration")):

    os.mkdir(os.path.join(main_folder, "Calibration"))

if not os.path.exists(os.path.join(main_folder, "Calibration/x_pos")):

    os.mkdir(os.path.join(main_folder, "Calibration/x_pos"))

if not os.path.exists(os.path.join(main_folder, "Calibration/wavelength_thar")):

    os.mkdir(os.path.join(main_folder, "Calibration/wavelength_thar"))

if not os.path.exists(os.path.join(main_folder, "Calibration/x_wavelength")):

    os.mkdir(os.path.join(main_folder, "Calibration/x_wavelength"))

if not os.path.exists(os.path.join(main_folder, "Object")):

    os.mkdir(os.path.join(main_folder, "Object"))