Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0fb185f57f0a9d89608a8c46cf87cd157e541090c0fbfd20613724ddf511e6eb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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