Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0b63b8a392c894e271ba518581b30d8780aa7eb4376dcd24c983908a61e34d1b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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