Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 89cc7abc67043eb66413e36e031e17dc4e3fcd26c9de88b8064656ae8556af82:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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