Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b9801b2d37b6a5fab513b85507f606132d28f776670e8b9e10a137e29486e4ca:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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