Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 06de732a6e68da6aebf4d2f15b0ec89cad6cd085c0bde155c2b342657c6a3f85:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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