Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5cfa3500e616ae66ec9a905459f703249f883e69b7429a39d3793c68dc6ec5df:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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