Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0b61f971181135e8ecd32618fad28e6da2336d5702287afa184b9e30834ded72:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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