Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7b3c590a6b47e113603d8e3978f5ab27e5b1d88d9699d48f7b707fc7425534a3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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