Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> da8fbab6729fe50161f6b301e9b3c26d56c37685a6302db79e500d2da10f94df:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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