Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cc72820cbac141c1048fe640b25eaf56b4f594dd6924d0f89f341e69eef19b80:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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