Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0a878b7e0e1fc4088e2f9c34cf5fd6e21d13a2c0376920b0b643824f342201f8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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