Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2eef0e08bf9ef69c4ca57c17122677f33f57a5ff172535bccd954348c3e58a76:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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