Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7b1ac287d64363914598bb805a74cd95a4f4a4a6314f99dd820d7ca56beef9dc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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