Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 836e7a14a2b36268cf77ddded2c9121bc1105e63ca107e7434fccc2f247e0b78:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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