Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9e91a8ebb727e06cd9fb109ee2f15d76951d3bdb7678529cde04a8239902581f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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