Warning: formlayout requires PyQt4 >v4.3

Hey all,
I try to create a .exe file using py2exe, but this error shows up when i try
to run the created file .exe:

Traceback (most recent call last):
  File "ModeloPitzer.py", line 2, in <module>
  File "zipextimporter.pyo", line 82, in load_module
  File "matplotlib\pyplot.pyo", line 95, in <module>
  File "matplotlib\backends\__init__.pyo", line 25, in pylab_setup
  File "zipextimporter.pyo", line 82, in load_module
  File "matplotlib\backends\backend_qt4agg.pyo", line 12, in <module>
  File "zipextimporter.pyo", line 82, in load_module
  File "matplotlib\backends\backend_qt4.pyo", line 16, in <module>
  File "zipextimporter.pyo", line 82, in load_module
  File "matplotlib\backends\qt4_editor\figureoptions.pyo", line 11, in
<module>
  File "zipextimporter.pyo", line 82, in load_module
  File "matplotlib\backends\qt4_editor\formlayout.pyo", line 51, in <module>
ImportError: Warning: formlayout requires PyQt4 >v4.3

My PyQt4 version is 4.5.4.

How can I solve that? Anyone?

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