Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5ce47945063f30a0401abe08ee9bbc8898cf19ab994d339880c09042bb4b10c7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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