Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 96a7a756216202ef0f35ebf771a0e75c3aa3f0fc1d6319fb40a261f86597df70:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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