Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7dc06cb5a734771250e141405c0f83dc00c4066623882cee8a87ce7e9388bd90:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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