Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a070f142943375e2e2ad4df61d1de0433d32a746b3b03e73ec47e1bdae4363b7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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