Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 93b62d4e399504756a60667485eedf1d0543f286823dc1f6777c7db662a007a4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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