Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5e71084117af2cec7902474cf44a17b56fcc18d22a70f60bd2b70a24388a0c4c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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