title: Can't load workbook with openpyxl: during handling of the above exception, another exception occurred
body: <p>I want to edit a xlsx file with openpyxl 2.5.0.</p>
  
  <p>This is my code and it works with an empty file:</p>
  
  <pre><code>from openpyxl import load_workbook
  
  wb = load_workbook(filename="Untitled.xlsx")
  ws = wb.active
  ws["B5"] = "test"
  wb.save("Export.xlsx")
  </code></pre>
  
  <p>However if I try to load <a href="https://ufile.io/gdtrt" rel="noreferrer">this file</a>, I get the following obscure error.</p>
  
  <pre><code>Traceback (most recent call last):
    File "C:\Matteo\PyCharm\CMakeR\venv\lib\site-packages\openpyxl\descriptors\base.py", line 57, in _convert
      value = expected_type(value)
  ValueError: invalid literal for int() with base 10: 'l'
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "C:\Matteo\PyCharm\CMakeR\XLSXEditor.py", line 3, in &lt;module&gt;
      wb = load_workbook(filename="Modulo CMR.xlsx")
    File "C:\Matteo\PyCharm\CMakeR\venv\lib\site-packages\openpyxl\reader\excel.py", line 274, in load_workbook
      for c in find_charts(archive, rel.target):
    File "C:\Matteo\PyCharm\CMakeR\venv\lib\site-packages\openpyxl\chart\reader.py", line 43, in find_charts
      drawing = SpreadsheetDrawing.from_tree(tree)
    File "C:\Matteo\PyCharm\CMakeR\venv\lib\site-packages\openpyxl\descriptors\serialisable.py", line 84, in from_tree
      obj = desc.expected_type.from_tree(el)
    File "C:\Matteo\PyCharm\CMakeR\venv\lib\site-packages\openpyxl\descriptors\serialisable.py", line 84, in from_tree
      obj = desc.expected_type.from_tree(el)
    File "C:\Matteo\PyCharm\CMakeR\venv\lib\site-packages\openpyxl\descriptors\serialisable.py", line 84, in from_tree
      obj = desc.expected_type.from_tree(el)
    [Previous line repeated 1 more times]
    File "C:\Matteo\PyCharm\CMakeR\venv\lib\site-packages\openpyxl\descriptors\serialisable.py", line 100, in from_tree
      return cls(**attrib)
    File "C:\Matteo\PyCharm\CMakeR\venv\lib\site-packages\openpyxl\drawing\shapes.py", line 349, in __init__
      self.l = l
    File "C:\Matteo\PyCharm\CMakeR\venv\lib\site-packages\openpyxl\descriptors\base.py", line 69, in __set__
      value = _convert(self.expected_type, value)
    File "C:\Matteo\PyCharm\CMakeR\venv\lib\site-packages\openpyxl\descriptors\base.py", line 59, in _convert
      raise TypeError('expected ' + str(expected_type))
  TypeError: expected &lt;class 'int'&gt;
  </code></pre>
  
  <p>I have really no clue what might be causing it. But from searching the internet, I gathered that it might be related to a style/formatting conversion issue.</p>
  
  <p>Thanks to Charlie Clark I noticed that - if I downgrade openpyxl to 2.4.9 - I can work around this issue. So it seems to be some sort of bug related to 2.5.0.</p>