Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8989004a4be6ce84297d27f0d5fe06d5a11fcc67b991a76191887ee7677b51d6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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