Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a557203e2e887aeab9431520430f2b01c1c9bfd9e815d104f5d36c3be0f3e4ac:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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