Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d06fbfe448c77497b06fa26d2460717ca011552fb18a7136cc5df0dd638e246e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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