Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> da54061b3c83cd94358863d5958b9943ef57c7c8757d52d1eb00a0f4e3d12ed0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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