Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f16a387f3bada0763b64f552706428d30fb299e9dc50a265bf1810d80da8fbca:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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