Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 97ba95508f8302dfae338e3a986b8d97b95c0012945297c145bf147ddb044406:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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