Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 94a5ef259db71eec7f981cebb0b7cf1b91062db9117298c3c5d300362ab9d399:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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