Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 43552c6c2c1db05e189a56ad916a665a5eabdf2f2acf02778adce9f8da7c1710:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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