Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b70dfe61308fbfd7e9e8a2698469d112ffac3dca81dfeda4fe6fd1c51157e0b2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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