Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 32b9516eddc6d7c59da603f8f792bac92afd13ee5f005a28ba0eda0f82083bd5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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