Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 69d2299227fb718e8766403acf025f7b91f51b87e9c16ac3e88c786727a1d4b1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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