visualizer raise e wand.exceptions.PolicyError: attempt to perform an operation not allowed by the security policy `PDF' @ error/constitute.c/IsCoderAuthorized/408

[eng-khaled1]

Describe the bug
as described in the max_storage_temp_tutorial i tried to display the candidates as follow :

vis = Visualizer(pdf_path)

# Get a list of candidates that match the FN[10] entity
fp_cands = entity_to_candidates(FP[10], test_cands[0])

# Display a candidate
vis.display_candidates([fp_cands[0]])

but it raises the following :

Error Logs/Screenshots

Traceback (most recent call last):
  File "/home/khaled/PycharmProjects/pythonProject2/main.py", line 437, in <module>
    vis.display_candidates([fp_cands[0]])
  File "/home/khaled/.local/lib/python3.8/site-packages/fonduer/utils/visualizer.py", line 90, in display_candidates
    imgs = self.display_boxes(pdf_file, boxes, alternate_colors=True)
  File "/home/khaled/.local/lib/python3.8/site-packages/fonduer/utils/visualizer.py", line 60, in display_boxes
    img = pdf_to_img(pdf_file, page_num)
  File "/home/khaled/.local/lib/python3.8/site-packages/fonduer/utils/visualizer.py", line 168, in pdf_to_img
    img = Image(filename=f"{pdf_file}[{page_num - 1}]")
  File "/home/khaled/.local/lib/python3.8/site-packages/wand/image.py", line 8293, in __init__
    self.read(filename=filename, resolution=resolution,
  File "/home/khaled/.local/lib/python3.8/site-packages/wand/image.py", line 8774, in read
    self.raise_exception()
  File "/home/khaled/.local/lib/python3.8/site-packages/wand/resource.py", line 243, in raise_exception
    raise e
wand.exceptions.PolicyError: attempt to perform an operation not allowed by the security policy `PDF' @ error/constitute.c/IsCoderAuthorized/408

Environment (please complete the following information):

• OS: [ Ubuntu 20.04]
• PostgreSQL Version: [ 12.0]
• Poppler Utils Version: [ 0.86.1]
• Fonduer Version: [0.8.3]

many thanks

[HiromuHota]

Duplicate of HazyResearch/fonduer#170