Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5861c7ad45a69e55c94485996306b8485dd87a3326a123d77f112508f4b594c3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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