Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8f376eef07c9c7b4d99c6ce844b460cb130a78fc96fa42e90bce554d169ab5ad:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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