Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8428e8c5bee75def8bedd64a2a867862671587381a0ffd6fd4729684af48dcd6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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