Python Pillow having error with dictionaries nested in list

I am creating a list of nested dictionaries to have the file addresses for images I will be using for my program. However, in the BU0 dictionary it seems to cause an error that reads:

SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 20-21: truncated UXXXXXXXX escape

Here is the nested list:

Bases = [
    {
        "BC0": ["Owl_project_picturesCommonGreat Grey Owl_greatgrey_base.PNG", "Owl_project_picturesCommonGreat Grey Owl_greatgrey_bonus1.PNG",
                "Owl_project_picturesCommonGreat Grey Owl_greatgrey_bonus2.PNG", "Owl_project_picturesCommonGreat Grey Owl_greatgrey_accent.PNG",
                "Owl_project_picturesCommonGreat Grey Owl_greatgrey_shadows.PNG", "Owl_project_picturesCommonGreat Grey Owl_greatgrey_eyesbeakfeet.PNG",
                "Owl_project_picturesCommonGreat Grey Owl_greatgrey_lines.PNG"],
        "BC1": ["Owl_project_picturesCommonBarn Owl_barn_base.PNG", "Owl_project_picturesCommonBarn Owl_barn_bonus1.PNG",
                "Owl_project_picturesCommonBarn Owl_barn_bonus2.PNG", "Owl_project_picturesCommonBarn Owl_barn_bonus2.PNG",
                "Owl_project_picturesCommonBarn Owl_barn_accent.PNG", "Owl_project_picturesCommonBarn Owl_barn_shadows.PNG",
                "Owl_project_picturesCommonBarn Owl_barn_eyesbeakfeet.PNG", "Owl_project_picturesCommonBarn Owl_barn_lines.PNG"],
        "BC2": ["Owl_project_picturesCommonBurrowing Owl_burrowing_base.PNG","Owl_project_picturesCommonBurrowing Owl_burrowing_bonus1.PNG",
                "Owl_project_picturesCommonBurrowing Owl_burrowing_bonus2.PNG", "Owl_project_picturesCommonBurrowing Owl_burrowing_accent.PNG",
                "Owl_project_picturesCommonBurrowing Owl_burrowing_shadows.PNG", "Owl_project_picturesCommonBurrowing Owl_burrowing_eyesbeakfeet.PNG",
                "Owl_project_picturesCommonBurrowing Owl_burrowing_lines.PNG"]
    },
    {
# The section that causes the error
        "BU0": ["Owl_project_picturesUncommonCrested Owl_crested_base.PNG", "Owl_project_picturesUncommonCrested Owl_crested_bonus1.PNG"]
    }
]

Answer

Try to escape the backslashes:

...

    {
        "BU0": [
            "Owl_project_pictures\Uncommon\Crested Owl\_crested_base.PNG",
            "Owl_project_pictures\Uncommon\Crested Owl\_crested_bonus1.PNG",
        ]
    }

...

Or put them as raw strings r"...":

...
        "BU0": [
            r"Owl_project_picturesUncommonCrested Owl_crested_base.PNG",
            r"Owl_project_picturesUncommonCrested Owl_crested_bonus1.PNG",
        ]
    }

...