Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1ed41af3a55445de1f7dada1e39c9c4d8b9d877e22d674a6900215c3ba5fcb91:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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