Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5b6aef9a0adeaf3f604902c02484eb615afbb02f6fe3b8373b0cd499cc0174ec:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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