Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b9f86b1d25a356d13cad39165c1f025c4c0eb69990046a89ad2157763faf5292:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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