Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 855a80a5414d8c7f5d6f37b2536a08ab44c578f8ad60ad2c3db8e4418e52b043:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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