Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7cfd521c4fff377c425b17cf282afb4d37c8963267877a3df6c5ef6ad0e6ec25:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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