Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8be7a8be1e8e4e66de7c09c5199380710faa6d3df059b05d21c84381b34a9316:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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