Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1a93430c451bb5d613e9cbc1917d9072b3b84752dd438addd6f03e1dee0cefdf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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