Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0b61f228465a8497f829229dfb5ce815c6cb398b7d07261dab8b5d884c2f730f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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