Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0c2963103f30460092331131d265a4826c5ec50914370bd5c858851224d1abab:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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