Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b3d86fdad26cd18c4e80f1f7c7d785191ce2d308ad65670efc2ef3b9444e46ce:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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