Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dda49d41327bd877cb0396c3e9f33401fa3d7e4514bd6d947dc9e9da591686c7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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