I can't complete, Execute Anonymous Blocks Challenge

I made Custom Object name is Candidate.

Can't edit Plural Label in Playground. Is right?


I clicked 'Verify Step'
and...     Challenge Not yet complete... here's what's wrong: 
Could not find an object with Plural Label Candidates.




Then I changed Singular Label : Candidates.
and : 
There was an unhandled exception. Please reference ID: TPOJWISC. Error: Faraday::ResourceNotFound. Message: NOT_FOUND: The requested resource does not exist


Okay, Then...
I made Candidate, and Candidates. Two Custom Object...
and : Challenge Not yet complete... here's what's wrong: 
Could not find an object with Plural Label Candidates.


What happen....?
How can I complete this unit?


Please need your help.....
I'm not complete simple challenge...

My issue may be tied to creating the Global Action and the appearance of a recod type field.
When I take the challenge, I get the following error:
"Challenge Not yet complete... here's what's wrong: 
Could not find an Opportunity Quick Action with the Label 'New Offer' and the action type of 'Create a Record'."


It would seem I did everything right, but I also see a Record Type field with 3 options, Products, Serivces, or Master. I set it to 'Master'. 

I then set the Predefined Field value to Stage: 'Qualification'



Then set the Publisher layout.


Am I missing something?

Thanks to anyone who can help. It would seemt the system can't find my Quick Action.

Hello I've installed Lightning Connect Quickstart via trailhead. Step 4 says select the External Orders app. Question - where is External Orders app found? After I find it I need to click Set Customer IDs to assign customer ID numbers to the sample account records in my Developer Edition.

Challenge Not yet complete... here's what's wrong: 
Could not find an account named 'Blackbeards Grog Emporium' created from Workbench with the Description 'The finest grog in the seven seas.'

I have created it twice: (I have to use localhost/workbench MAMP due to my company security policy)