Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d5fdb411a363eca1bd14b258d4f155217c993a1270d016231aca9dd81a70f2f4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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