Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 42d03dc6ac37b5d4ff3c7777fbee67f0d992e9c22e2673d30990ad4faef67a46:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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