Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 98c1c4cb329768419ea6b89e8ef50687e95bda7c5069ae85e07295c56a1e19ca:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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