Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 296ce5ac6e0fd9a35ae3d0e915e83414aac3a988aea96997482977b13bbf10da:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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