Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> df67f35b091f8fc011beae8a0fe8accebc4f6558f85f1bcea2f4f69748b1c7cd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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