Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 16d7ec51b61b4e273e74eab63747b46c352da563826e81d205c08299c1fbcf2c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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