Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b76f7a9c76fdd4874964b7a3107395726622b2ae5f910a6e4b57c02c0cffe182:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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