Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ecf5cb9a146aed643a591c4920da78a07d4ca0f7e70b38ba69fbf4fc2ed98ce3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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