Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e70228b4fd6e47b49a3c7c3a86084986e7b311ce7240390a3383dd28ed29aaa6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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