Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c48e4a293cf51e15c1888d2845ed6ed8a1d81c78ada071f5c93c5105cdc49f14:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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