Hi, I'm having some difficulty with the Defining Sharing Rules challenge. The error message I am getting says "Challenge not yet complete...here's what's wrong: An object with the API name Project__c does not exist or does not contain the Priority__c picklist field."
Here's a screenshot of my object with my field. is this an error with the checker system, or am I misunderstanding something? Thanks!

I am practicing on trailhead via using my developer org. The chalenging asked me to Create a Guest Administrator and deactivate it. I am currenly the System Administrator of my developer org. We have only one license for System Administrator. How should we solve this issue in order to:
Create a new user using the System Administrator profile and then deactivate that user to preserve the licenses in your org.The new user must use the System Administrator Profile.
The username for the new user must include 'guestadmin' somewhere in it.
The new user must be inactive.
I need some hints or advices. Thanks.

To pass this challenge, create a new list view which only shows contacts belonging to you that have been created or modified in the last week.The list view must be named 'My Recent Contacts'.
The list view should only be visible to you.
The list view must show contacts belonging to you that have been created or modified in the last week.

Please help !!