Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bc9e1f1002e18caae2b703b9b2ce3838fc9d103f97f416b9e17c1c7e853c26b8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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