Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1244a176bdb79dfbbe408f7f79ad59830124b6e3e80bb7fddd96bafa940d9537:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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