Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e0ea5b7a99bdf6ab820dd7543c096e936621ff361f0faa41bd193f95404b8c15:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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