Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c0536450b9b963c3d0098d5b3eeb132cec58e3a16a5c23a088c70f1684c0c034:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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