Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3c76300693aa92f05b2c8abb150a8e27d095782d587094f453cc1f7f0222c547:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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