Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f931793dfd9686c832f145f79bf0777745ac2b6c36bd5a155bda34868f7b19f0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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