Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3ccccd1630a5390944aca1557d9a1f12e7494f08a000693eb55157b5cd012ac5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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