Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ffc2c684ebd6d696eb96b4880de6f8cbe55a1db4637f32f386b1bdbff4321437:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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