Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ea0e5b8a56632920803c8e4c42381586b7fe6ac4fd8c99cd8c64c2f7384872c2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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