Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 026016c30b523f87fc0382288eef6217d964687037420f5dbed131e2a0101a6b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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