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.

Hi @SAI DEEPTHI C

I'm a member of the Trailhead Help team, We see that you have completed the 'Customize a Salesforce Object' Project.. kindly share the solution that helped you resolve the issue or please make sure to mark the response which helped you to resolve your query as 'Best Answer' so that it might help the fellow Trailblazer's who are facing the similar issue. 

Thank you!