Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2ecba06c64bde62d3360e65f2ab03febe9ef3fc40bb3939049300b3e7b20c729:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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