Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7440ae56a55fe46472e5efe77679a02691bee46d64d5258c97655955ca05661c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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