Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9a7d9d912734c4e63f911a749c602530b70a6309664887f660853bc6fa6978c9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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