Traceback (most recent call last):
  File "run.py", line 2, in <module>
  File "C:Python27Libsite-packagesPyInstallerloaderpyimod03_importers.py", line 395, in load_module
    exec(bytecode, module.__dict__)
  File "site-packagesPySimpleGUI27__init__.py", line 2, in <module>
  File "C:Python27Libsite-packagesPyInstallerloaderpyimod03_importers.py", line 395, in load_module
    exec(bytecode, module.__dict__)
  File "site-packagesPySimpleGUI27PySimpleGUI27.py", line 14, in <module>
  File "site-packagesfuturestandard_library__init__.py", line 459, in install_aliases
ImportError: No module named UserList
[16016] Failed to execute script run

import PySimpleGUI27 as sg
import parse

layout = [
    [sg.Text('A2L File', size=(15, 1), auto_size_text=False, justification='right'),
     sg.InputText('',key='_a2l_'), sg.FileBrowse(file_types=(("A2L File", "*.a2l"),))],
    [sg.Text('Signals Lexicon', size=(15, 1), auto_size_text=False, justification='right'),
     sg.InputText('',key='_sigLex_'), sg.FileBrowse(file_types=(("Excel File", "*.xlsx"),))],
    [sg.Text('Parameters Lexicon', size=(15, 1), auto_size_text=False, justification='right'),
     sg.InputText('',key='_parLex_'), sg.FileBrowse(file_types=(("Excel File", "*.xlsx"),))],
    [sg.Text('Module Name', size=(15, 1), auto_size_text=False, justification='right'),
     sg.InputText('X',key='_module_'), sg.FolderBrowse()],
    [sg.Submit(), sg.Cancel()],
    [sg.Output(size=(60, 20))]
]
window = sg.Window('A2L Parser', default_element_size=(40, 1)).Layout(layout)

values_dict={}
while True:
    button, values_dict = window.Read()
    if button=="Cancel" or button is None:
        break
    elif button=='Submit' and (not any(value == '' for value in values_dict.values())):
        parse.parser(values_dict['_a2l_'], values_dict['_sigLex_'], values_dict['_parLex_'],window)

    else:
        sg.Popup("Please select files")

window.Close()