Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fb0b8c6a3006ade35be542683ec2e6e8dc3d724114ff8505cc616eb4a63bca1f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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