Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
  --> 936f2e574d0ce832b9e49f96cd347abb0be2036c784735c5b8d9102e6a5e103d:80:20
   |
80 |         let item <- self.listing.purchase(
81 |             payment: <-self.paymentVault
82 |         )
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16
    |
243 |                 self.details.purchased == false: "listing has already been purchased"
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^