Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 31c6da6e19c7defeaf30afd4d0a3ebcada42a2ff2d4def87c20162004b3d9c2d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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