Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
  --> 8b44761bd4ff50495c1f4cf7a9e62194133f9c21fa4e38e7482e4f4ee3fbb870:72:20
   |
72 |         let item <- self.listing.purchase(
73 |             payment: <-self.paymentVault
74 |         )
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:271:16
    |
271 |                 self.details.purchased == false: "listing has already been purchased"
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^