Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4f516db0de27a1bdc0b507b5bf27c9e2d47430c85a378a9cb35c743b70144f4d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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