Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8a0a6f0504256946c8613e98a6b65274dc6b0eac35c7686af7a1a3393214d910:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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