Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 53981437ad9b2a8d2259a61b87f601ba9e3e6719ac3dae61669d284e319a127d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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