Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 209a6b4561ca827381a41ea63e9aa1cf98e3a2f3caa6591a013fc174a9dc20d6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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