Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 006a10c43504c7a9c8d6e2b36e1d453930fa9e6455c956725263fa04ab966dfc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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