Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1b18d9fe243d686d0a94f7359b6bbabb64e56f2087899fe286dd7dbdf2b348e4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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