Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9fd3d78f680eed5b03a87c9fd4bb1224f31606ff6b5deb4afac897496495bc42:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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