Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3100ff5b35a8b04cc31e29a9b8f9eb661943e01b0339cab593356e4e0f93830f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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