Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ea0b56e414f9366c26f4b4e9bd55c81ca45b038133f06e7e359a4fdb9c04a1ea:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16