Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d6af5fcfccf399abb9f2de31db56c4a926b0b047fb7b76415a5a1503cb0d84b2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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