Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e17bca99e9680df528cbb0c4c9878d83a2f681eff7fc5423e8942b7f54846da0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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