Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ee66c26eebefda1617c04e5d5b40cf010cecee15b358f140a4b67404ca1de9a0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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