Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ef59867c0417ce29412c8eae4e6cf58973b8bd1999ee7445ec51bc826b84149a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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