Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9eb95f40cfc91adbb017db48990cb5a2a0f0b1a45178a3014e9c952a379a7ad6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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