Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c92b9e472570ada26f7b4fad12191537503d0d245ff7f78e7c4ed6879c6b4628:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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