Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bcf8a3393259a0273649f1659e789c4947e230cb72b7d3d1585cbba921d52e5f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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