title: Python PDFMiner error: "No /Root object! - Is this really a PDF?"
body: <p>I am getting this error "No /Root object! - Is this really a PDF?" using my MAC computer with Python 2.7 and <a href="https://pypi.python.org/pypi/pdfminer/" rel="noreferrer">PDFMiner</a> version 20110515. 
  The pdf files are not damaged because the same program with the same files works on my PC computer! Also I have tried many pdfs and this error exists for all of them. Any ideas of what I should change in my MAC to not to get this error? </p>