Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a6e4ae5c395246864e2b578660d2508645314e502b0c7dc7cdcd2afc5ac59bd5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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