I'm working on Trailhead Challenge to Create a flow to streamline entry of new accounts, contacts, and opportunities.

I've got a screen with:

• First Name
• Last Name
• Company Name
• Opportunity Amount
• Opportunity Stage

Then Record Create to Create Account:

• Name = Company Name
• Variable AccountId

Then Record Create to Create Contact:

• FirstName = First Name
• LastName = Last Name
• AccountId = AccountID

Then Record Create to Create Opp:

• Name = Company Name (Can i use formula for Company_Name + "-" + Last_Name?)
• CloseDate = Flow.CurrentDate (can I use Flow.CurrentDate + 30?)
• AccountId = AccountID
• StageName = Prospecting
• Amount = Opportunity_Amount

The flow saves. But when I run it and enter info, I get error:
"An unhandled fault has occurred in this flow
An unhandled fault has occurred while processing the flow. Please contact your system administrator for more information."


At first, I thought it was because my formula weren't working to concatanate company name and last name, or to add 30 days to date for close date. But even when I remove the formulas and just use the screen fields, I get the same error.

What am I doing wrong?