What does it mean in python AccessInit: hash collision: 3 for both 1 and 1?

I have 4 python files. From PHP i run the first python file that call the others, but i got this error:

AccessInit: hash collision: 3 for both 1 and 1 

What does it mean?

Here, talks about the same module called in different way, it is possible?

# Import this carefully
try:
    import Image, ImageDraw, ImageFont
    pil_available = True


from PIL import Image, ...

I checked my "import module" i don't have found a different importation

Those are my imported modules:

import os
import glob
import scipy
import numpy as np
import pymorph as pm
#import pylab as plb
import os
import math
#from matplotlib import pyplot as plt
import cv2
import mahotas as mh
from skimage import morphology