Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8497a686f57bbf7fe6fab06bb358ce818b7fcfd70d551f328a7e3b565cd0e54e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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