Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1caa26f8f2000d47dd8be9c1b3ab99b60d3030740ecb7687f0261ca5c9951902:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16