Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3a305409abe792f2d15285b5d0a5ce908b7d67db22613c9a201e3b09470da2bd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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