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I have been attempting to render 3d objects and have been successful for the whole day until just recently. I am constantly getting the following error:

"error rendering 3d scene -- error downloading /blobs/836a1670-2631-40ea-87a8-a4047e9e432d.sage3d?uuid=836a1670-2631-40ea-87a8-a4047e9e432d"

Here is my code

counter3 = 0
counter2 = 0
counter1 = 0

#array for the list of points
pts = []

# Your substitution
w = WordMorphism('1->12,2->13,3->1')

# Your word you wish to apply the substitution to
toApplyOn = "1"

# Number of times to apply the substition
upTo = 4

# empty graphics object
P=Graphics()

for j in range(upTo):
    word = w(toApplyOn)
    toApplyOn = word

for x in word:
    previousVector = v

    if int(x) == 3:
            counter3 += 1

    if int(x) == 2:
            counter2 += 1

    if int(x) == 1:
            counter1 += 1

    v = (counter1, counter2, counter3)
    pts.append(v)

    if not int(x) == (len(word)-1):
        if int(x) == 3:
               P += line3d([v,previousVector],color='red')
        if int(x) == 2:
               P += line3d([v,previousVector],color='blue')
        if int(x) == 1:
               P += line3d([v,previousVector],color='green')

P+=point3d(pts,color='black')
P

My code is suppose to output a 3D image (a neat looking staircase).

I am using the Sage Math Cloud as my environment. Does anyone else get this error? Does anyone have ideas why I receive this error?