Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b9ab32d865f09a417efe7a7ff76e150e7d0787d06bc4053153c1a4a9407073c6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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