Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bf4161793a1acdac8390b2885be21394b4587995f3279c3db680494d5fd42fe5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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