Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> eeca4fd97f171d3f59e6b534b018b0091055d717254fe64db4cd2586f55e3c9d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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