Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9942bc0b5bb828bf759ee83c18591c590a843189488105383b68e094642807a9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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