Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a9168558b1082c21876812a8d52dcc37e6a3bea0f86866b501f7ba912b480955:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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