Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 227fc7bf59d0169d70b59013ca14854338b27a6a5b831476d374f4b29bd2274f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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