Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0afbdbf46856d405b3b9d728b25de95b9e092e9b946c12931b83c28d86e355b2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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