Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 06e20ddf9167b9b56da3e8684982f645c8e5c33ad81a1417039f97179b3a1ac7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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