title: tkPDFViewer working only once then throw : image "pyimage1" doesn't exist
body: <pre><code># Importing tkinter to make gui in python
  from tkinter import*
    
  # Importing tkPDFViewer to place pdf file in gui.
  # In tkPDFViewer library there is
  # an tkPDFViewer module. That I have imported as pdf
  from tkPDFViewer import tkPDFViewer as pdf
    
  v2= NONE
  # Initializing tk
  root = Tk()
    
  # Set the width and height of our root window.
  root.geometry(&quot;550x750&quot;)
    
  # creating object of ShowPdf from tkPDFViewer.
  v1 = pdf.ShowPdf()
    
  # Adding pdf location and width and height.
  v2 = v1.pdf_view(root,
                   pdf_location = r&quot;YourPdfFile.pdf&quot;, 
                   width = 50, height = 100)
    
  # Placing Pdf in my gui.
  v2.pack()
  root.mainloop()
  </code></pre>
  <h2>How to reproduce the bug :</h2>
  <ol>
  <li>Run the code above once, It will display the .PDF in the window.</li>
  <li>Close the Window.</li>
  <li>Run again the code</li>
  <li>Then you will get the following issue :</li>
  </ol>
  <p>.</p>
  <pre><code>Exception in thread Thread-10:
  Traceback (most recent call last):
    File &quot;C:\ProgramData\Anaconda3\lib\threading.py&quot;, line 973, in _bootstrap_inner
      self.run()
    File &quot;C:\ProgramData\Anaconda3\lib\threading.py&quot;, line 910, in run
      self._target(*self._args, **self._kwargs)
    File &quot;C:\ProgramData\Anaconda3\lib\site-packages\tkpdfviewer-0.1-py3.9.egg\tkPDFViewer\tkPDFViewer.py&quot;, line 61, in add_img
    File &quot;C:\ProgramData\Anaconda3\lib\tkinter\__init__.py&quot;, line 3728, in image_create
      return self.tk.call(
  _tkinter.TclError: image &quot;pyimage1&quot; doesn't exist
  </code></pre>
  <p>Does someone knows how I can fix this ?</p>