Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ba4b3996775b6fceeb322e92dfc49a20c16339d4ceb964102ce9633c9df2c974:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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