Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 47368359b4c49c57ad8cac80b7bc1507497df8a837b80e777311e7300dd7db12:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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