Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 523230464c94eef0f98fc374f68d2af8efa9f0dc92a44f16ce404db13f3c47df:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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