Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 79622faf48f7780cccb900e484c83c551f9e4eb065dd34e0ed3659e75b6a806a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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