Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a64c13cab9978324ad321b0658356a75c1ff30806318b8b2202411a69fb12feb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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