Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ab7d16921d8ca551298b0c6ccf754bca05a1fa7154d3d4ff706c176036b83db8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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