Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2f97b801cc48419b2f50dc7738aba8a7799fbf8ad4693447ffb8a67325b9ad8c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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