Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 72d63c39fb87ba68041e7526044e263f984da55f1deda791f1a88ad1b70dfea8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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