Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a124cd2c0db4d44fbdc6a3241fb6d787ef442e0b68a5ee9eaa982185e0e81972:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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