Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 57d4a9cf457bca81af3314b4719c4803c0c82b8a997fec2692164f2c5f3aa3da:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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