Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7c3858626584551639709761a3e81a32cc95e07adb2269f1be8400f7e3b2916d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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