Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5809042b1f324dd764735328cece0059dc21fbd0e09bc855a5402d106fee9e68:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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