Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a0f1911d4bfeb872adb8af1c370c6397d84a43454e56ee56a22dd6c11ba01f34:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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