Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
  --> ac0c69531dafe5c215ca03f0668a833650428119d33d17274dbb12f221404537:72:20
   |
72 |         let item <- self.listing.purchase(
73 |             payment: <-self.paymentVault
74 |         )
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:271:16