Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f69f4c3643c0af60fe3a3762adf09c6b79b18c0a4f0bf258905f58727c7c7c13:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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