Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8ea773acc343b6cd1f56d32140dfc7a4f09d9729aea6188db4a5b1a80e5fad01:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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