Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 158132b21bffd1ec35b59f2d00498a5258c2c8f325ccfd4e09e14dc490964608:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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