Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c9a9780be182f935def1b8471bc7d01e561fb7b54d0f91f3d2bb7697e8fa17b7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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