Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0acbcb12acc44d67b814ec74a9f18c1673ea4ff6ae59da1b0bb776252fa4384a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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