Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 15226869d742c4978c82b94e0b087434cc4a232f437217e4fed58b4c4aedee77:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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