Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
  --> 6d7f003e5004339b0cf760428e92c3c9580c6a89ffd822a7752f5dadc3a90211:85:24
   |
85 |             let item <- listing.purchase(
86 |                 payment: <-listingPaymentVault
87 |             )
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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