Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> caf5f6bbfb7d8764a8cca33f5c5a6bc882dc297c64e5d37e87eb548657f209d7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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