Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a4d2cc84e6f8a5859acec0154356d98155968f973a8717ef99e6065861c06eb1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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