Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9616bff0011a5aa2aa0a8d6eacfd8bd3df2be417526860af7a79b9c0d8854176:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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