Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4b18c74eb0057120b57e4d55662aab9298ba2ceaed3bb2e3ca7866eb67352eaf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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