Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 476968fdf02cd9d858d1c076b2ac6f72fa4f3a0262d01d93714a4d386e76aa74:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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