Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8764d1e18b99469ee1ba81c4aa8f12394f82e3c631962e108119954bacfd258e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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