Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 56cac996119d4668b00d5a78c86eabeb76677275a46f68cd223d12819f633f0f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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