Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 83db51474f73155f769b55f3d8cf97598170270cf0d8dc71826dfb09bb9434d0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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