Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 10b6f1b74ba05063470f9c097c3d43e6c3ca11dbeb1771a6be56e7011cc7b5b5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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