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Karyn GladstoneKaryn Gladstone 

Entitlement Management Set Up Required Support Steps in Trailhead page access error

I am partway through the Trailhead for Entitlement Management: Set Up Required Support Steps.
After I create a Milestone, I am attempting to add a time trigger under warning actions. However, when I click on Add Time Trigger, I get this error message: 
Sorry to interrupt
This page has an error. You might just need to refresh it. First, would you give us some details? (We're reporting this as error ID: )

When I x out of that error, I see this error: You don't have access to this record. Ask your administrator for help or to request access.

How can I proceed with this lesson?