Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6b84c666f119c6ea2ab458948754c008f5e122c02e55d36cb4e2116f2531524e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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