Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f32ffa2b7d4a1cd1c695716f4cfd80971eb896b97787af076dbb9b3e3fa9aa5c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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