Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8bd90ca30e6ec783855dd1d705513ca997ebf58991fb47e9325efeb41f6b6649:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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