Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 591e6045cf8f71e3be6382cc0b45c112fc2eab59c957aa3c3ae9c2e950cf2395:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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