Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5797184b9b24274416de636c81cdad56f22e8fdb420239a6a0f9e2981d6bbfb2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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