Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
   --> 55c502cdbedf4e0969b98796fd862b7aa11d5e597c07bda0b58c20fe0434ca62:103:20
    |
103 |         let item <- self.listing.purchase(
    |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefrontV2:322:16