Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0f7d3531d41a6bb6e1505ae698c5e84834d96bb10845be8cffc5b957b58efec2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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