Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bd2de9f24b7d0664762d7343e19a6c261558fcc37f6e81a3ab71455a50817273:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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