Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d9cb0c6cf42a8552a24e060ddd5620aaa3baec0e355371748f85a40d963e9e59:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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