Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5cd159c40e8e10c7b754f0636d15c81469501d9fe0605aaa2d57af8eecdcb4b6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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