Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2f39e1712af1d8d86bb420f9b02e8e30fff6cd830d7fff1365a0270be4e93a86:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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