Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d10f6ac64b936816b657299ed68181a41c312c3483cec294f2d46174ca055d15:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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