Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cf307646a34974c065c47a6aba5c4756ec39c14f8cdfe242d5cffb5d090e6b00:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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