Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
  --> 811513c2a9d5d6834d966999b94aba53e6ffa5883fe8b709f4b2cbb9f713de6f: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