Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 94e96c4d9770e022b799829d6c43a3572f452bf59ce324844da78144156c3dd5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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