Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8491183a77e867cd63f9fb3be5c49463623bd56a9b1e25e74842f8fe047e7a6f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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