Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1c47b020aee9080c3c367f947803d0afce8b21f36bd8e107ffa6b0eabdb4d2b2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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