Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4b82a158faff72fb7eedaef195a2bc631f606c20e7f6b1cd19b9a868d7f78a75:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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