Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1bcd6c7292398c17678f4d2c14bf5256078229987baa3934f15ed60d5f6baa29:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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