Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 123ed4f13f4ad7782d003bc05eb97e6d121f155b436d04667288d0bea2bb23f9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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