Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6745c0268f9b60708fdb65867318685441bf5e4a3eeb749dc8add45f5de522eb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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