Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 407f6190bc99aa55859f66dfa6a0a031158144a68a8e1b2bdb30f517fcac17aa:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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