Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e41433d825747c9825032e369effc12b4ca8679a89d617e045cd260fd4dda772:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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