Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9ae1030294d9d0d057ffea3787639564b8bf8199e3d79d1ddc4e6ddd0499524e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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