Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5c7b4258ce7c92752802c38a2732b22d895b78857e2c429b8c13c7afa884170e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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