Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ce8e1c3929a8f69258ec45addffdfe84703bb074c45a03894c623e3148e965df:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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