Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b0c5c04ece3d7fdef88226dd2c881bd4d1f8895f87c6b84495eec7f52a46497b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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