Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bececf08f1ecb069a93297784e41c5e4b624d31cf756718c0a3955c277371e08:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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