Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7e57ed093e04fa81e7e0e6702bef38b85cf8896bcc87175343c963a58d24e950:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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