Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ad25e168f577a0d55a67a7592d542654aed63487f76e50e90d5bbd82a6bfe613:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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