Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4b5554da4d5268c04582084da2dd4ca53a40e113533d8c40de7363e9337e6b60:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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