Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6508fa32af8c249da2c5c644d4f981721132f00315faa8a2d3483222afea9e34:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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