Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 23b0d0ef4645586a70b3b0d833f3c55d5db99e68bc99f196821a1a01849601e7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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