Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f23a072b377234ccc6fbd865f302799801df8668c5410ee07cf03f08c57c4d47:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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