Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9fd6b7d5454707286a6e2fb93ff5f95ba485d0895eac60674ba7f10f1a59c140:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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