Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> abccbb6b7ce5c6e51bfa20974fbf0104a995aad658c530d5feb1d2828fd56a45:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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