Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8a911950fa0c000054a50f486ad21e88d6c2ebd7425cdde77dd3ef37db65c35b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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