Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2d58e3688ed934b72f3d0c392a422aecaf9efce67b65df35065fe4105475af04:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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