Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2cfbd2a62fac2a450762b94c1c86ace922eba677d0ac0d376ad6789bd4ba6c51:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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