Traceback (most recent call last):
  File "config/MODULE_CGI.py", line 74, in run
    func()
  File "en_monounit.cgi", line 501, in main
    mystring = Wohneinheiten(Wohnungscode)
  File "en_monounit.cgi", line 56, in Wohneinheiten
    bilderfiles = os.listdir(bildordner)
UnboundLocalError: local variable 'bildordner' referenced before assignment