Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 83fcc6711b8300410a362a1cfabdc4b6a000ea11110fea34cc7f20c60f9c47d4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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