Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c67fa283b9984ed95b796a474b0c2be2f57e5ab1c18c988345c59523480dc36f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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