Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0936287ff2431f1bb91dc6e54f2293be5eda46b0d840214bb2fcf3a96ff53d47:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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