Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 746e00b3aa5f28e12fa0d1146ccc5137299f919e9a347849f62cbc7909ee2147:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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