Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5133dde4195bd0aa75e7832b3cfc44d86811f2a4020bacca8ef4689e9f4b076f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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