Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 61fb2d0f78f21198db52c7fd39de91a1ae6d743bd2c81435e4b9d3aed9dc68b5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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