Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 915477b10a7b9da94f0ab02390a70c62a1c91163144f6ea7a9f029a982ac625e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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