Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a804f84998782ce51fdad9089e89284f55f9c4a28adb7551f63d8f00779e808f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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