Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 29610a9b12bd35c5d682c10d2eeee8717e115de835cc4ef8f96bc4f92b6e7631:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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