Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 56a6a96d3a64098ed86ead3ce557ed81f14c0623bfc579c106fb2dfa1efb4cca:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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