Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 08c50b5bc43ba560730fdbc5ef9e8bfa9bff3053e99765b938b0b7d4c5b95626:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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