Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 095b0c8ddd95d4953ca349019ca62b3666a808e6606348f3c2cffe5fd5cfe45a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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