Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b23a7bad68aca45aa27755246c3262ea5181cc27e6ab3864b776e499817187e0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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