Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c465dd6718860da5f19df639509dc9807ba2a0523218cf4767d67b15588713e9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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