Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1777d9bbc518bf9457680e24682af4ff8ef4800565e27675ba9e2457e8a3fc63:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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