Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2ac9a1d482e75e178b2478c45285433e1ec349e3e8f6299d3b3428b948e94647:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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