Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 880eab8c065ff778cb2c0f60962347d1e1fb9787339d5714c478cd0c6fb9b82e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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