Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b2e5a1d3149728a49828770b8a0f5b22835b12baa6399c0d4fdf1f688c13d295:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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