Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 86659b179add8ae16f8cd62f5d9c6859a3ac3cc8c64dfca814d360e923734a9e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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