The steps in somewhere over the rainbow don't work.  
Note: You must create at least one new Communication record in order to complete this step.
Click  and select Communications.
Click New.
Give the record any name, and fill out all fields with values you choose. Click Save & New.
Create a few more records with different options. Be sure to select a different number each time.
Click and select Groups.
Select Life on Mars.
View the Chatter posts that the rover created.

I get the following error:
Challenge Not yet complete... here's what's wrong: 
Could not find a record in the Communications object. Ensure that you insert at least one record before attempting this challenge.

The 2nd module asks for an object called communication or plural communications.  I generated various records and nothing works including updating the group publisher layout to add records.  Please advise.