Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dd51bc7c3cf457bdc8febe480c4b17bf8a9ad7f7afa37393d7ffdec59e131777:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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