Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6f6cd897f0a45c517b73f1c0e04d44928da7b7697b90ecaa9a3dd5edf4387249:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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