Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bd94104c3dc77b908b7c158a0360f13b198aca6db3f6d2f3848cfdf88546f4de:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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