Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 51a3e69b381e9b28a7898a8d4aac8e310b41211e813758569b3696b577c8378b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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