Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c17df7e87177093bdc27be96ff2bbabf8dfe99349c69203c1b6e115aaa5f4901:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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