Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b05318c1e6f88327a48cfce90407387e1154c9f433fa7429375ef86d79632b89:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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