Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3ee4393d7e472273321b66f164bbe11230e7ab136349fa631ffd63a0f37f0129:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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