error message " An unexpected error occurred while inserting Opportunity records and we couldn't check your work. Make sure Opportunity records can be inserted in this org, and click "Check Challenge" again. If this continues, contact the Trailhead Help t

hey everyone

i am stuck here for the last 3 days

module/ unit  - Customize a Salesforce Object - Create Validation Rules

An unexpected error occurred while inserting Opportunity records and we couldn't check your work. Make sure Opportunity records can be inserted in this org, and click "Check Challenge" again. If this continues, contact the Trailhead Help team.

Verify step to earn 100 points

i don't know how to get out of this, kindly help.