Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1eb9f011d753a1ecee151ea72bb826a0f5da0bd06b2624b0ff062fd5cd6df59c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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