Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ca2a1f8e122dc3ea7b4f3a37585c3ea18da154c433e723cc1e4c67007dad9332:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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