Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 049b9e228d6e5b54389b8920192e2211efb5a042323134bfdb781e87f134d0a9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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