Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 266d0aa694a6d3f9cdb9c118112114f16c51dd7ebd2643b52dcbd6678049dc9a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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