Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1b79f8cd55b574d2799c6a7f879b554371307d5116216839659088b3213d84f4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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