Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 410dd5f8a3e683654f16bf85693bd3e3b6b43c3767e19d2d08a16c1cff22d3cf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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