Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fbd106768d2772baf0ead8ad7b4d584145a2d1714a392f41c217a5cdd8364b1e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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