Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2fc5838ca08bb96d647d8d3649b206fef67e0e076ee9f442ee048f639c725971:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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