Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 48a0f93aac7a43fdcdd8f0e2110e99138b6fbf2469b4a6028028fb22e497ff93:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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