Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4404d1013f298eb8e21cec1696f157a4931986bc9b7b86ece8e4e62e43b66009:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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