Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b68b52f342a59770b5a016fa25bd4e27d78244dac1e25803e864182fac7eb6e7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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