Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9fa1765b5cd659609032bef0de14df51ddd338fb996e54d740045d5653ea84c4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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