Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 08cab207438419695180db9b1bdb133451656355fd53873febfac6d07f7cc16c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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