Problems runing the "cmsRun runGEMCosmicStand_data.py"

[casfisica]

Following the [twiki](https://twiki.cern.ch/twiki/bin/viewauth/CMS/
GEMCosmicRayAnalysis), it says:
" You'll need to modify the configureRun_cfi.py file.

An example file valid for run000044 - run000057 is available:

/afs/cern.ch/user/d/dorney/public/configureRun_cfi.py"

When I use the file above mentioned, happens below

adding chamber gem11L_c2_r3.xml
adding chamber gem11L_c2_r2.xml
----- Begin Fatal Exception 23-Aug-2017 17:33:28 CEST-----------------------
An exception of category 'ConfigFileReadError' occurred while
[0] Processing the python configuration file named runGEMCosmicStand_data.py
Exception Message:
python encountered the error: <type 'exceptions.AttributeError'>
'module' object has no attribute 'GEMMask'
----- End Fatal Exception -------------------------------------------------