Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c5ac4f2156b3896f81572f47ab102dd25dd78feb5b3e2463c1fbf0c3aa2cbead:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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