Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dcd4fae6cc6244ebf7ac65bbf744b15db28739bcff4ce7e1dec14f9268786df8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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