Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c677e79c9c34fbf76e80effee1ca8c66a56bb167ed33e400341b2b27039e2d40:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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