Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b5d65bfe4552e0045b7cca0cd03c502d089cb57d13d48dd8fd5275796a560369:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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