Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 98de888915cf0892f2665b4bee9fc4517c630980b6e7f3422e34a7c24efe9cb3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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