Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c66fdce4a604a60f15d562aa82c4ec4ea24c125c072a3c9b7ed99a7be5b323dd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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