Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3df2adffa7d2fe3bf7de4b2121ea58cc1a444b391eba3d1a10132b656b2cb8ac:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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