Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6badc09ad513a90e223bd988738db70c6ab81f3701e6b3138070ab5d27b7c964:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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