Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 810fe2218a0b6d865a6d2c925c6fa88bac2a935b6236a6c9ed9ec56aadc4fdcf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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