Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e8d3bcb3b8fd51d65e124d3f85b7b865c51926cdfda720fccae2128f6dca3ba3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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