Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5a0aca2a2d2e6eab22ad9630c6b6eabcd7f2e098e0c238d56cbe46309788f21c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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