Unicorn Remote can't find pillow module

[Griefed]

When I run a program to display an image, it errors because it can't find the pillow module which is required to display images.

 #!/usr/bin/env python

import time
from sys import exit

try:
    from PIL import Image
except ImportError:
    exit('This script requires the pillow module\nInstall with: sudo pip install pillow')

import unicornhathd as unicorn

def run(params):
    width, height = unicorn.get_shape()

    img = Image.open('doom.png')

    try:
        while True:
            for o_x in range(int(img.size[0] / width)):
                for o_y in range(int(img.size[1] / height)):

                    valid = False
                    for x in range(width):
                        for y in range(height):
                            pixel = img.getpixel(((o_x * width) + y, (o_y * height) + x))
                            r, g, b = int(pixel[0]), int(pixel[1]), int(pixel[2])
                            if r or g or b:
                                valid = True
                            unicorn.set_pixel(x, y, r, g, b)

                    if valid:
                        unicorn.show()
                        time.sleep(0.5)

    except KeyboardInterrupt:
        unicorn.off()

That produces a "This script requirtes the pillow module | Install with: sudo pip install pillow" message. Thing is though, pillow is installed.

Running this .py by itself, without Unicorn Remote, works just fine:

#!/usr/bin/env python

import time
from sys import exit

try:
    from PIL import Image
except ImportError:
    exit('This script requires the pillow module\nInstall with: sudo pip install pillow')

import unicornhathd

unicornhathd.rotation(0)
unicornhathd.brightness(0.3)

width, height = unicornhathd.get_shape()

img = Image.open('doom.png')

try:
    while True:
        for o_x in range(int(img.size[0] / width)):
            for o_y in range(int(img.size[1] / height)):

                valid = False
                for x in range(width):
                    for y in range(height):
                        pixel = img.getpixel(((o_x * width) + y, (o_y * height) + x))
                        r, g, b = int(pixel[0]), int(pixel[1]), int(pixel[2])
                        if r or g or b:
                            valid = True
                        unicornhathd.set_pixel(x, y, r, g, b)

                if valid:
                    unicornhathd.show()
                    time.sleep(0.5)

except KeyboardInterrupt:
    unicornhathd.off()

Any ideas?