Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6b44ccafe3eab1248c447957e2878694ce19bf728a9e04a807da5908a54be341:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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