Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> adad57d3e79462e192d02856c3f790b64dcf15445a0f9d9fe5535c254a5a729b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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