Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 88f472f92e5960afc65b2f71452e4629881e95f24fde41739d1e09bf88ca1f9c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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