Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cfc26fb0287070cf7cef3c8f23c0d27ee0fc2e41a13285f7eca6692ea798b77e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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