Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4cf2deccf02d397d31e6d73e58b9ce426acce6a2cfd70281130d8e5589703a4c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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