Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 400f23b544e47e306fa03fb192e927ce8f6bfb4e3a8176500712291336c5c43f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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