Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3ba0326a82258a9cc57b46ef6fd6faa52930d5d26c34e2d1421dea78befb024c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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