Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 478edae2a7eb6db77a1372d9423e8ab79fbfc662865d98182f9e9a961c6b3cae:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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