Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 512246bafe0bf174b73f96ec53e662820b2a622e62ef5915926d5796cc585125:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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