Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ba90634ba6eebbcca1d6758270be68e72f341b84efebf85aa8f4af41ff940b2d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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