Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6e48772c6529e54587a5e7e9d7a33858cb486a278e9bac91fba89a84bfb40ad4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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