Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f50da266f3d26ea06cfa8022428f377bb2d77ca62c0207cf3d4939ef2f718c91:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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