Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ac24da8fd8110db160e723aac4a5605f1ca4f384b8f73c82c7ec63d1af8609f2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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