Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 03f4e61c12d46da35eca1b2a71d159d5349a42c3018c0458cbebfa9e9343890f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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