Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6efb1a036ad50293fc1d18b98f57480fe930ef1f1289e5cf6d60ba5efab0d256:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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