Hi All

The 'Define Forecast Rollups and Default Date Ranges' unit is giving me the following error when I have done exactly what is asked in the challenge, hence an apparent error in the Trailhead checking process:
Challenge Not yet complete... here's what's wrong:
Couldn’t find default forecast display period 'Monthly', starting on '1 month ago', display '4 months'. Please double check the instructions.

Is there some apparently irrelevant setting I need that is not specified? It's not as if this is a complex unit!

Thanks
Keith