Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b8ee998582b284803a00cb0d380592a327342bc163bd5c10bb71256f3d8b83f4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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