Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> deb71b9fa6f48f7a6cb21b698fd66f58a939d6d3a737f9903a7fca946827759d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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