Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 544fca84dec360253fd5b968e6d3fee259706969758a1756f0fc1c7c6d54c665:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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