Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 35161b24afaa6c4dd187a8f02c7b33e45e39d2c89b6817bd4608031cf6176b41:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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