Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0697a557388090eb70158cc0681a4fc9daa7d7329f350101b3ce5bd1fa5b8d1b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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