Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9985990d8c949cbbc6d2ea3c1813fae4013a88a19065258f6d7c85a8a22dbb7d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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