Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7679d6ea50f8ed1859ea80ecf4b134f5c47e569a842535780a9776a5be34349b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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