Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e5f216dfe5b9707240d9cdd914a659cb316a40eb65cffdf36ecef3510b70b629:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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