Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b9e78a0ae9dd1c512ff67a4d52f8acc01a41a22baf426661bfa402ed119e53e4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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