Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ed5966852c487068154c1e94b552ce3687e2eb50fc4c2b500a9b780d3617bc3d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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