Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0ba6978bfaf17936dc7f7d854c1cbd8f64ccf181357400d695ac3e0c9155bdb0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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