Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> efa03db0b0ecd3f3338a8b5db9585b2dcd57048dfb70e7ea1ef4d36a198c3c93:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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