Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3e0ee0b348412218a5b13038daccbcefd08f3d98b014f061c8144a730b6f6800:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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