Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3a812acbdab4e5e604ece8be20421182a437044a9bb418508f6770beacf1ebf9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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