WindowsError: [Error 32] os.unlink

I get the Error 32, when I use the pdf-function.

                from pp.client.python import pdf
                result = pdf.pdf(destdir, 'princexml', server_url=SERVER_URL)
                output_filename = result['output_filename']

Error message:

File "c:\zope\eggs-plone43\pp.client_python-0.3.0-py2.7.egg\pp\client\python\pdf.py", line 75,
in pdf
os.unlink(zip_filename)
WindowsError: [Error 32] The process cannot access the file
because it is being usedby another process: 'c:\\users\\username\\appdata\\local\\temp\\tmppcvf_d'

My system: * windows 7 * python 2.7 64-bit * plone 4.3.1 * pp.client-python 0.3.0 (in 0.2.9 is the same error)

pp.server (0.3.5) is installed on linux server.

Solution:

I closed the file before the command os.unlink(zip_filename):

    openfile=files.get('file',None)
    if openfile:
        openfile.close()

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