Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1bd2cabe1e85e631224c4cb979532174d1365c962cab01df9e87ca3c5a25718e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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