Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1a1797030ce6530e95f600433c77f27da41bbf7afadb5d981c3ff8ac50406b62:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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