Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5d64f131d308076a9d2d9d9640295585eb9199d7b05ac5e29ec2f0bb958c4388:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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