Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0929693215d0cccb61a6cc3ac36d225a12c8f59f4b8f09d8293340676ff9fbc3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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