ColorRooms - Period issue

Hi,
I performed a monthly simulation. When i try to show the results per month (Only January, February, etc) i get the following error in the colorRooms component:

Runtime error (AssertionException): Duplicate month was found in the collection: 1

Traceback:
line 61, in init, “C:\Users\Abraham\pollination\python\Lib\site-packages\honeybee_energy\result\colorobj.py”
line 302, in init, “C:\Users\Abraham\pollination\python\Lib\site-packages\honeybee_energy\result\colorobj.py”
line 107, in script
line 1373, in validate_analysis_period, “C:\Users\Abraham\pollination\python\Lib\site-packages\ladybug\datacollection.py”
Capture
Thanks,
-A.