Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6a87db0612dd611c5272aa4d0601c5b3175049a242a70fa91a6cac9762d175fc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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