Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7dc19311085887ea26e18cc2d1345603596203dc5c924522e3965c4c23c99fb4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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