Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c23fb7108f020b6cc8e8e950f4c8bde31b119259c3495ef3087300aa7f2591fc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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