Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 83737ab0dbf60723adb07c328c6d14ed13a5567d1e62f268a9a1dbc9b5a00671:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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