Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c8339f4c1e829af7e949a13ce69309f7921ad0fcaad04eb5530af6ab29672e80:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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