Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 51096af1f70b99ed3fd691e31ee5d352ec386e11e549ab20219bc73dd5646df5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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