Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e7844ab122a03e513555cd8857046f48d63acd8d1846d47608461723d4d4d8d5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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