Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b4f1266b89d1d2981a8579ed0204bf8a48a167d3937c777939004594e8a7e351:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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