Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5350499d9e10b8144f9cf12fd2e7ceab5e984a1768af61e6a14d46dabbd9f53c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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