Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 44fda2d04b73ab835ddd65667df3b8e0f47d55e66493090476464a44c8a1c9c7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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