1.Create a new event compact layout with the label: Showing Mobile Layout
2.Add the following fields to the compact layout in this order: Subject, Start, Property, Name.
3.Make the new compact layout the default for the Showing record type. (Hint: Do not change the primary compact layout for events. Enable the new 4.Showing compact layout in the Record Type Overrides section of the layout assignment editor.

For step 2. I don't have the option of the Property field and am unable to add it as a custom object to Event in the Schema Builder.
Also getting error id INDQUWUO

I have done everything but I still get this error that is not helpful becauseI have done what it asks.

Challenge Not yet complete... here's what's wrong:
Either the contact object does not have a compact layout named 'Phone and Email', or it is not set as the primary compact layout

1. I created a custom object 'Contact'
2. I created custom fields of name (text), phone (phone type), mobile (phone type), and email (text type).
3. Then I made a new custom compact layout called 'Phone and Email'
4. I make 'Phone and Email' my primary compact layout

What did I do wrong?? Am I missing a step?? Please help.