Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fbc789173afe5d83383fefc30a470c43a231126425ab8a9e31c75cfe0117a361:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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